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>
diff --git a/src/northbridge/intel/i440bx/Kconfig b/src/northbridge/intel/i440bx/Kconfig
index 3f574a4..36d4754 100644
--- a/src/northbridge/intel/i440bx/Kconfig
+++ b/src/northbridge/intel/i440bx/Kconfig
@@ -15,6 +15,7 @@
 
 config NORTHBRIDGE_INTEL_I440BX
 	bool
+	select NO_MMCONF_SUPPORT
 	select HAVE_DEBUG_RAM_SETUP
 	select LATE_CBMEM_INIT
 	select UDELAY_IO