drm/amdgpu/nbio7.4: don't use GPU_HDP_FLUSH bit 12

It's used internally by firmware.  Using it in the driver
could conflict with firmware.

Reviewed-by: James Zhu <James.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2021-10-08 10:21:42 -04:00
commit a0f9f85466