ELPG flush is initiated from a common broadcast register, but must be
waited on via per-L2 registers. Split gk20a and gm20b versions of
the flush.
Change-Id: I75c2d65e8da311b50d35bee70308b60464ec2d4d
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/401545
Reviewed-by: Automatic_Commit_Validation_User
1c9aaa1eaf