arch: remove stage_exit()

It's no longer used. Remove it.

Change-Id: Id6f4084ab9d671e94f0eee76bf36fad9a174ef14
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/13678
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
8 files changed