ANDROID: drop KERNEL_DIR setting in build.config.common

And replace many references of ${ROOT_DIR}/common with
${ROOT_DIR}/${KERNEL_DIR}, which makes it a lot easier
to branch off of ACK and update the KERNEL_DIR.

The variable of KERNEL_DIR will be set in build/_setup_env.sh
to the directory of the build config file by default if it's
not set explicitly in the build config file or in environment.

Test: build test with following configs
        common/build.config.gki.aarch64
        common-modules/virtual-device/build.config.cuttlefish.aarch64
        common-modules/virtual-device/build.config.goldfish.aarch64

Bug: 162785964
Change-Id: I790ac0ded10bd790484f14c6f93d53e06c38b830
Signed-off-by: Will McVicker <[email protected]>
Signed-off-by: Yongqin Liu <[email protected]>
(cherry picked from commit 931718fa65fe5e34d143250c048f591a7d74e5f8)

Author: Will McVicker

build.config.allmodconfig.aarch64

@@ -1,4 +1,4 @@
-. ${ROOT_DIR}/common/build.config.common
-. ${ROOT_DIR}/common/build.config.aarch64
-. ${ROOT_DIR}/common/build.config.allmodconfig
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.common
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.aarch64
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.allmodconfig
 

build.config.allmodconfig.arm

@@ -1,4 +1,4 @@
-. ${ROOT_DIR}/common/build.config.common
-. ${ROOT_DIR}/common/build.config.arm
-. ${ROOT_DIR}/common/build.config.allmodconfig
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.common
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.arm
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.allmodconfig
 

build.config.allmodconfig.x86_64

@@ -1,4 +1,4 @@
-. ${ROOT_DIR}/common/build.config.common
-. ${ROOT_DIR}/common/build.config.x86_64
-. ${ROOT_DIR}/common/build.config.allmodconfig
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.common
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.x86_64
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.allmodconfig
 

build.config.common

@@ -1,6 +1,5 @@
 BRANCH=android-4.19-stable
 KMI_GENERATION=0
-KERNEL_DIR=common
 
 CC=clang
 LD=ld.lld

build.config.gki-debug.aarch64

@@ -1,3 +1,3 @@
-. ${ROOT_DIR}/common/build.config.gki.aarch64
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.gki.aarch64
 TRIM_NONLISTED_KMI=""
 KMI_SYMBOL_LIST_STRICT_MODE=""

build.config.gki-debug.x86_64

@@ -1,3 +1,3 @@
-. ${ROOT_DIR}/common/build.config.gki.x86_64
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.gki.x86_64
 TRIM_NONLISTED_KMI=""
 KMI_SYMBOL_LIST_STRICT_MODE=""

build.config.gki.aarch64

@@ -1,6 +1,6 @@
-. ${ROOT_DIR}/common/build.config.common
-. ${ROOT_DIR}/common/build.config.aarch64
-. ${ROOT_DIR}/common/build.config.gki
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.common
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.aarch64
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.gki
 
 ABI_DEFINITION=android/abi_gki_aarch64.xml
 KMI_SYMBOL_LIST=android/abi_gki_aarch64

build.config.gki.x86_64

@@ -1,4 +1,4 @@
-. ${ROOT_DIR}/common/build.config.common
-. ${ROOT_DIR}/common/build.config.x86_64
-. ${ROOT_DIR}/common/build.config.gki
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.common
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.x86_64
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.gki
 

build.config.gki_kasan

@@ -1,6 +1,5 @@
 DEFCONFIG=gki_defconfig
 POST_DEFCONFIG_CMDS="check_defconfig && update_kasan_config"
-KERNEL_DIR=common
 function update_kasan_config() {
     ${KERNEL_DIR}/scripts/config --file ${OUT_DIR}/.config \
          -e CONFIG_KASAN \

build.config.gki_kasan.aarch64

@@ -1,4 +1,3 @@
-. ${ROOT_DIR}/common/build.config.common
-. ${ROOT_DIR}/common/build.config.aarch64
-. ${ROOT_DIR}/common/build.config.gki_kasan
-
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.common
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.aarch64
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.gki_kasan

build.config.gki_kasan.x86_64

@@ -1,4 +1,4 @@
-. ${ROOT_DIR}/common/build.config.common
-. ${ROOT_DIR}/common/build.config.x86_64
-. ${ROOT_DIR}/common/build.config.gki_kasan
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.common
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.x86_64
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.gki_kasan