Handle beta CB sizing differences for GfxP versus WFI channels. Bug 1686189 Change-Id: Icc421eeb8305f7e4156a74c957662f19504ddad7 Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com> Reviewed-on: http://git-master/r/801533 (cherry picked from commit 95b9ae4e5f3c29fdb97567d846b9d2139f1a8ec4) Reviewed-on: http://git-master/r/815682