FROMGIT: drm/amdgpu/acp: Powrgate acp via smu

Call smu to power gate/ungate acp instand of only
powr down acp tiles in acp block.
when smu power gate acp:
smu will turn off clock, power down acp tiles,check and
enter in ULV state.
when smu  ungate acp:
smu will exit ulv, turn on clocks, power on acp tiles.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

(cherry picked from commit 3a54d2c8
git://anongit.freedesktop.org/drm/drm of origin/drm-next branch)

BUG=b:117711307
TEST=Build & Boot on Careena

Change-Id: I8ba4ad0ecb6203fbb7716a2daf15ededfc01689f
Reviewed-on: https://chromium-review.googlesource.com/1294554


Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Hang Zhou <hang.zhou@amd.corp-partner.google.com>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>