BACKPORT/FROMGIT: drm/amd/pp: Add ACP PG support in SMU

when ACP block not enabled, we power off
acp block to save power.

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 982976d9
git://anongit.freedesktop.org/drm/drm of origin/drm-next branch)

Conflicts:
drivers/gpu/drm/amd/powerplay/hwmgr/smu8_hwmgr.c
[Hang Zhou]
Ported relevant changes to
drivers/gpu/drm/amd/powerplay/hwmgr/cz_hwmgr.c.
Bringing in smu8_hwmgr.c will require too much of rebasing effort.

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

Change-Id: I4d6b8d9eb729bdf42e20050bc7cf6cd97c37b086
Reviewed-on: https://chromium-review.googlesource.com/1294556


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>