drm/amdgpu: change aca bank error lock type to spinlock

modify the lock type to 'spinlock' to avoid schedule issue
in interrupt context.

Signed-off-by: Yang Wang <kevinyang.wang@amd.com>
Reviewed-by: Tao Zhou <tao.zhou1@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>