dt-bindings: clock: am43xx: add clkctrl indices for new data layout

The new data layout will be split based on clockdomain boundaries, instead
of CM boundaries. This introduces a few new clkctrl providers, that have
different indices for the clkctrl data.

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