Separate gm20b platform data from gk20a data. Change-Id: Ie90ebc9e06ba94dfe852dfe07c163cd00fd90a9c Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com> Reviewed-on: http://git-master/r/396376 Reviewed-by: Automatic_Commit_Validation_User Reviewed-by: Arto Merilainen <amerilainen@nvidia.com> Reviewed-by: Bo Yan <byan@nvidia.com>