Build failure with FIT_SIGNATURE

[maxmosk]

When building with this flag in the config, the following error occurs:

lib/cmac.c: In function ‘cmac_verify’:
lib/cmac.c:53:17: error: ‘SECURE_BOOT_KEY_ID’ undeclared (first use in this function)
   53 |                 SECURE_BOOT_KEY_ID, sig);
      |                 ^~~~~~~~~~~~~~~~~~

Macro SECURE_BOOT_KEY_ID defined in include/configs/s32.h and protected by CONFIG_SECURE_BOOT. This config flag does not exist.

branch/tag: release/bsp31.0-2020.04
commit: 6286902
config: s32v234sbc_defconfig