CHROMIUM: config: Build in mmc for x86

Switch from module build to built-in.  This works around a build
breakage when building mmc as a module.

BUG=none
TEST=x86-generic compiles again.

Change-Id: If709220502fc65633aa1258b4d25cf5df2387647
Signed-off-by: Dylan Reid <dgreid@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/255300
Reviewed-by: Olof Johansson <olofj@chromium.org>
1 file changed