drivers: gpio: silabs: gpio driver enhancements for EFR series 2 devices

Added changes to gpio driver and Kconfig
for EFR series 2 devices.

Signed-off-by: S Mohamed Fiaz <[email protected]>

Author: fimohame

drivers/gpio/Kconfig.silabs

@@ -13,7 +13,9 @@ if GPIO_SILABS
 
 config GPIO_SILABS_COMMON_INIT_PRIORITY
 	int "Common initialization priority"
-	depends on GPIO_SILABS
 	default 39
+	help
+	  Main GPIO controller has to initialized before the GPIO themselves.
+	  "GPIO_INIT_PRIORITY - 1" is usually the right value.
 
 endif # GPIO_SILABS