soc: arm: nxp_s32: s32k1: fix code cache init

Currently Code Cache cannot be enabled because its initialization is
guarded by Kconfig options which depend on CPU core cache support,
but S32K14x devices has a SoC specific L1 cache controller. Hence,
introduce a SoC-specific symbol to enable Code Cache.

Note that the cache controller is not available for S32K11x devices.

Signed-off-by: Manuel Argüelles <manuel.arguelles@nxp.com>