bcm27xx: Deactivate CONFIG_OABI_COMPAT

This deactivates the kernel option CONFIG_OABI_COMPAT.

The old arm OABI is not needed any more, we compile all applications for
the new ARM EABI.

This reduces the attack surface of the kernel syscall interface.

On all other targets CONFIG_OABI_COMPAT is already deactivated.

Signed-off-by: Hauke Mehrtens <[email protected]>

target/linux/bcm27xx/bcm2708/config-5.15

@@ -256,7 +256,6 @@ CONFIG_NO_HZ=y
 CONFIG_NO_HZ_COMMON=y
 CONFIG_NO_HZ_IDLE=y
 CONFIG_NVMEM=y
-CONFIG_OABI_COMPAT=y
 CONFIG_OF=y
 CONFIG_OF_ADDRESS=y
 CONFIG_OF_CONFIGFS=y

target/linux/bcm27xx/bcm2709/config-5.15

@@ -320,7 +320,6 @@ CONFIG_NO_HZ_COMMON=y
 CONFIG_NO_HZ_IDLE=y
 CONFIG_NR_CPUS=4
 CONFIG_NVMEM=y
-CONFIG_OABI_COMPAT=y
 CONFIG_OF=y
 CONFIG_OF_ADDRESS=y
 CONFIG_OF_CONFIGFS=y