soc/intel/braswell/Kconfig: Remove ENABLE_MRC_CACHE Kconfig

This option was removed in the following commit:
* 80f5d5b fsp1_1: remove duplicate mrc caching mechanism

Change-Id: I08ef4fc6029cc066e4f7b9c82b6b187a9794afdb
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-on: http://review.coreboot.org/11462
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/soc/intel/braswell/Kconfig

@@ -17,7 +17,6 @@ config CPU_SPECIFIC_OPTIONS
 	select COLLECT_TIMESTAMPS
 	select SUPPORT_CPU_UCODE_IN_CBFS
 	select CPU_INTEL_TURBO_NOT_PACKAGE_SCOPED
-	select ENABLE_MRC_CACHE
 	select HAS_PRECBMEM_TIMESTAMP_REGION
 	select HAVE_MONOTONIC_TIMER
 	select HAVE_SMI_HANDLER