Adds basic PG503 support allowing devinit to complete. JIRA: EVLR-1693 Change-Id: Ice8a9ba18c8bba11f6bc174ba2c2d8802a738706 Signed-off-by: David Nieto <dmartineznie@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/1532746 Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com> Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>