drm/amdgpu: VCN v5_0_1 to prevent FW checking RB during DPG pause

Add a protection to ensure programming are all complete prior VCPU
starting. This is a WA for an unintended VCPU running.

Signed-off-by: Sonny Jiang <sonny.jiang@amd.com>
Acked-by: Leo Liu <leo.liu@amd.com>
Reviewed-by: Ruijing Dong <ruijing.dong@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit c29521b5)
Cc: stable@vger.kernel.org