elog: Add post codes for FSP stages

Add defined post codes from coreboot for the various FSP stages
so we can easily identify FSP hangs.

TEST=boot on chell with reset in FspSiliconInit that will show
post code 0x93 in the log and see that it is correctly identified.

Change-Id: Iffd11a3f8bbb3d2508dd6fc0a3efb737da493b95
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/317986
Reviewed-by: David Hendricks <dhendrix@chromium.org>
2 files changed