drm/panfrost: Add bus_ace optional clock support for RZ/G2L

drm/panfrost: Add bus_ace optional clock support for RZ/G2L

On RZ/G2L SoCs, the GPU MMU requires a bus_ace clock to operate correctly.
Without it, unbind/bind cycles leave the GPU non-operational, manifesting
as an AS_ACTIVE bit stuck and a soft reset timeout falling back to hard
reset. Add bus_ace_clock as an optional clock, wiring it into init/fini,
and the runtime suspend/resume paths alongside the existing optional
bus_clock.

Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Adrián Larumbe <adrian.larumbe@collabora.com>
Link: https://patch.msgid.link/20260320164158.487406-4-biju.das.jz@bp.renesas.com
Signed-off-by: Adrián Larumbe <adrian.larumbe@collabora.com>