Memory init config is board specific. Thus, move it to variant level and
hook up variant romstage.c.
Change-Id: Id78788815ad9c4ed64f0172fb746ff6e50d608ef
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49132
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>