drm/amd/amdgpu: allow use kiq to do hdp flush under sriov

[ Upstream commit bf2bc616 ]

when use cpu to do page table update under sriov runtime, since mmio
access is blocked, kiq has to be used to flush hdp.

change WREG32_NO_KIQ to WREG32 to allow kiq.

Signed-off-by: Victor Zhao <Victor.Zhao@amd.com>
Reviewed-by: Emily Deng <Emily.Deng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Stable-dep-of: c9b8dcab ("drm/amdgpu/hdp4.0: do a posting read when flushing HDP")
Signed-off-by: Sasha Levin <sashal@kernel.org>