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/mainboard/emulation/qemu-i440fx/Kconfig

@@ -4,7 +4,6 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	def_bool y
 	select CPU_QEMU_X86
 	select SOUTHBRIDGE_INTEL_I82371EB
-	select CACHE_AS_RAM
 	select HAVE_OPTION_TABLE
 	select HAVE_PIRQ_TABLE
 	select HAVE_ACPI_TABLES