ARM: dts: am33xx: convert to use new clkctrl layout

Convert AM33xx to use the new clockdomain based layout. Previously the
clkctrl split was based on CM instance boundaries. The new layout
helps with introducing the interconnect driver instances.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>