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/amd/socket_AM2r2/Kconfig

@@ -3,7 +3,6 @@ config CPU_AMD_SOCKET_AM2R2
 	select CPU_AMD_MODEL_10XXX
 	select HT3_SUPPORT
 	select PCI_IO_CFG_EXT
-	select CACHE_AS_RAM
 	select X86_AMD_FIXED_MTRRS
 
 if CPU_AMD_SOCKET_AM2R2