soc/amd: Standardize guards on header files

The guards in the header files were inconsistent. Some had no leading or
trailing underscores, some had one, some had both leading and trailing.

Change all to double leading & trailing underscores.
Change all comments to have a space before them instead of tabs

BUG=b:62235990
Test=Build Kahlee

Change-Id: I4466df529ab201c922096a31d7438381778b582f
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/21073
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marc Jones <marc@marcjonesconsulting.com>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
19 files changed