starfive: add CONFIG_PAGE_BLOCK_MAX_ORDER

This is removed from generic and moved to subtargets[1]

[1] openwrt@ac0cb87

Signed-off-by: Zhihao Xu <ngc7331@outlook.com>

Author: ngc7331

target/linux/starfive/config-6.18

@@ -378,6 +378,7 @@ CONFIG_OVERLAY_FS_INDEX=y
 CONFIG_OVERLAY_FS_METACOPY=y
 CONFIG_OVERLAY_FS_REDIRECT_DIR=y
 CONFIG_PADATA=y
+CONFIG_PAGE_BLOCK_MAX_ORDER=10
 CONFIG_PAGE_EXTENSION=y
 CONFIG_PAGE_POOL=y
 CONFIG_PAGE_REPORTING=y