drm/amdgpu: Add ring reset callback for JPEG4_0_3

Add ring reset function callback for JPEG4_0_3 to
recover from job timeouts without a full gpu reset.

V2:
 - sched->ready flag shouldn't be modified by HW backend (Christian)

V3:
 - Dont modifying sched/job-submission state from HW backend (Christian)
 - Implement per-core reset sequence

V4:
 -  Dont create reset_mask sysfs and return -EOPNOTSUPP on VFs (Lijo)

Signed-off-by: Sathishkumar S <sathishkumar.sundararaju@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Leo Liu <leo.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>