Drop redundant select CACHE_AS_RAM

The few remaining boards without CAR override this with
select ROMCC.

Change-Id: Ifd5223e67f6a2dadb47846bdaab40b1be763cf69
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/6172
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

src/cpu/intel/socket_mPGA479M/Kconfig

@@ -6,4 +6,3 @@ config CPU_INTEL_SOCKET_MPGA479M
 	select CPU_INTEL_MODEL_F2X
 	select MMX
 	select SSE
-	select CACHE_AS_RAM