sign_official_build.sh: dump more md5sum on bios.bin

Dumping md5sum information along the way of signing bios.bin to shed
some lights on the signing process in order to debug the first slot
issue.

BUG=b:77252439
TEST=None
BRANCH=None

Change-Id: I5083d6db2eee42c5cc9588606f95bbffba0c00ff
Reviewed-on: https://chromium-review.googlesource.com/1036802
Commit-Ready: YH Lin <yueherngl@chromium.org>
Tested-by: YH Lin <yueherngl@chromium.org>
Reviewed-by: C Shapiro <shapiroc@google.com>
1 file changed