drm/amd/pm: correct the baco reset sequence for CI ASICs

[ Upstream commit c108725e ]

Correct some registers bitmasks and add mmBIOS_SCRATCH_7
reset.

Signed-off-by: Evan Quan <evan.quan@amd.com>
Tested-by: Sandeep Raghuraman <sandy.8925@gmail.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>