Remove explicit select MMCONF_SUPPORT

Make MMCONF_SUPPORT selected with MMCONF_SUPPORT_DEFAULT.

Platforms that remain to have explicit MMCONF_SUPPORT are
ones that should be converted.

Change-Id: Iba8824f46842607fb1508aa7d057f8cbf1cd6397
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/17527
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
 	select MMCONF_SUPPORT_DEFAULT
 	select MRC_SETTINGS_PROTECT
 	select NO_FIXED_XIP_ROM_SIZE