drm/amdgpu/gfx9.4.3: Implement compute pipe reset

Implement the compute pipe reset, and the driver will
fallback to pipe reset when queue reset fails.
The pipe reset only deactivates the queue which is
scheduled in the pipe, and meanwhile the MEC pipe
will be reset to the firmware _start pointer. So,
it seems pipe reset will cost more cycles than the
queue reset; therefore, the driver tries to recover
by doing queue reset first.

Reviewed-by: Lijo Lazar <[email protected]>
Signed-off-by: Prike Liang <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

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