ARM: dts: dra7: add bus functionality to base PRCM nodes

Add simple-bus compatibility and ranges properties to cm1, cm2 and prm
nodes. This is done in preparation of adding the support for clkctrl
nodes.

SPLIT: timer1 fck setup

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