drm/amdgpu/sdma: Refactor SDMA reset functionality and add callback support

This patch refactors the SDMA reset functionality in the `sdma_v4_4_2` driver
to improve modularity and support shared usage between AMDGPU and KFD. The
changes include:

1. **Refactored SDMA Reset Logic**:
   - Split the `sdma_v4_4_2_reset_queue` function into two separate functions:
     - `sdma_v4_4_2_stop_queue`: Stops the SDMA queue before reset.
     - `sdma_v4_4_2_restore_queue`: Restores the SDMA queue after reset.
   - These functions are now used as callbacks for the shared reset mechanism.

2. **Added Callback Support**:
   - Introduced a new structure `sdma_v4_4_2_reset_funcs` to hold the stop and
     restore callbacks.
   - Added `sdma_v4_4_2_set_reset_funcs` to register these callbacks with the
     shared reset mechanism using `amdgpu_set_on_reset_callbacks`.

3. **Fixed Reset Queue Function**:
   - Modified `sdma_v4_4_2_reset_queue` to use the shared `amdgpu_sdma_reset_queue`
     function, ensuring consistency across the driver.

This patch ensures that SDMA reset functionality is more modular, reusable, and
aligned with the shared reset mechanism between AMDGPU and KFD.

v2: Renamed sdma_v4_4_2_set_reset_funcs to sdma_v4_4_2_set_engine_reset_funcs.
    Renamed sdma_v4_4_2_reset_funcs to sdma_v4_4_2_engine_reset_funcs.(Alex)

Suggested-by: Jiadong Zhu <[email protected]>
Suggested-by: Alex Deucher <[email protected]>
Signed-off-by: Jesse Zhang <[email protected]>
Reviewed-by: Alex Deucher <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

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