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/mainboard/emulation/qemu-i440fx/Kconfig

@@ -3,6 +3,7 @@ if BOARD_EMULATION_QEMU_X86_I440FX
 config BOARD_SPECIFIC_OPTIONS # dummy
 	def_bool y
 	select CPU_QEMU_X86
+	select NO_MMCONF_SUPPORT
 	select SOUTHBRIDGE_INTEL_I82371EB
 	select HAVE_OPTION_TABLE
 	select HAVE_CMOS_DEFAULT