Modify the clock nodes for the ATL clocks to use the ATL clock driver to
handle them.

Add the ATL device node at the same time for DRA7.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>