drm/amdgpu/userq: add context and seqno of the fence

Add context and seqno of the fence in error logging
rather than printing fence ptr.

Reviewed-by: Christian König <christian.koenig@amd.com>
Suggested-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Suggested-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Signed-off-by: Sunil Khatri <sunil.khatri@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>