drm/amdgpu: fix documentation warning

Fixes this issue:
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:5094: warning: expecting prototype for amdgpu_device_gpu_recover_imp(). Prototype was for amdgpu_device_gpu_recover() instead

Fixes: cf727044 ("drm/amdgpu: Rename amdgpu_device_gpu_recover_imp back to amdgpu_device_gpu_recover")
Reviewed-by: Kent Russell <kent.russell@amd.com>
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

@@ -5098,7 +5098,7 @@ static inline void amdgpu_device_stop_pending_resets(struct amdgpu_device *adev)
 
 
 /**
- * amdgpu_device_gpu_recover_imp - reset the asic and recover scheduler
+ * amdgpu_device_gpu_recover - reset the asic and recover scheduler
  *
  * @adev: amdgpu_device pointer
  * @job: which job trigger hang