`meminit_memcfg()` does common memory configuration, which is not
specific to each DIMM. Thus, move it out of the for-loop and call it
once.
Change-Id: If74875b45cd0d7a759883eaf564505ebf281bed5
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60058
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
b32599ea89