MMCONF_SUPPORT: Flip default to enabled

Also remove separate MMCONF_SUPPORT_DEFAULT flag.

Change-Id: Idf1accdb93843a8fe2ee9c09fb984968652476e0
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/17694
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/apollolake/Kconfig

@@ -32,7 +32,6 @@ config CPU_SPECIFIC_OPTIONS
 	select GENERIC_GPIO_LIB
 	select HAVE_INTEL_FIRMWARE
 	select HAVE_SMI_HANDLER
-	select MMCONF_SUPPORT_DEFAULT
 	select MRC_SETTINGS_PROTECT
 	select NO_FIXED_XIP_ROM_SIZE
 	select NO_XIP_EARLY_STAGES