intel/model_6ex: Prepare for dynamic CONFIG_RAMTOP

Change-Id: I9bfaa53f8d09962d36df1e86a0edcf100bb08403
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/15229
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
18 files changed