video: tegra: host: gk20a: Remove acm dependency

video: tegra: host: gk20a: Remove acm dependency

The gk20a driver has relied on nvhost acm functionality. This
patch adds runtime pm and genpd support to gk20a driver itself so
that nvhost acm calls are not used at any point.

This patch does also the /minimal/ binding to not regress scaling
functionality. Dependencies against nvhost_scale still remains.

Bug 1454499

Change-Id: I7d9e4b170b9672ed9469e4fcd53c1a176a5d44ea
Signed-off-by: Arto Merilainen <amerilainen@nvidia.com>
Reviewed-on: http://git-master/r/365423
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>