arm: Update a stale comment in bootblock .S files

This just updates a comment which refers to "board_init_f". We use
bootblock main() in coreboot.

BUG=none
BRANCH=none
TEST=locally compiled.

Change-Id: I4cb6b3c11f163b67fe48de495d13dce88710efc0
Reviewed-on: https://chromium-review.googlesource.com/172095
Reviewed-by: Gabe Black <gabeblack@chromium.org>
Commit-Queue: David Hendricks <dhendrix@chromium.org>
Tested-by: David Hendricks <dhendrix@chromium.org>
3 files changed