drm/amdgpu: Add printing for RW extracted from VM_L2_PROTECTION_FAULT_STATUS

RW is also useful in most cases.

Signed-off-by: Yong Zhao <Yong.Zhao@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>