ARM: dts: AM4372: Add USB nodes

Add nodes for 2 instances each of
	- ocp2scp
	- USB PHY control module
	- USB PHY
	- dwc3_omap
	- USB

for AM43xx.

Signed-off-by: George Cherian <george.cherian@ti.com>
Acked-by: Roger Quadros <rogerq@ti.com>
Acked-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>