dt-bindings: Add a new binding for Broadcom V3D 3.x and newer GPUs.

Broadcom V3D GPU

Only the Broadcom V3D 3.x and newer GPUs are covered by this binding.

For V3D 2.x, see brcm,bcm-vc4.txt.

Required properties:

- compatible:	Should be "brcm,7268-v3d" or "brcm,7278-v3d"

- reg:		Physical base addresses and lengths of the register areas

- reg-names:	Names for the register areas.  The "hub", "bridge", and "core0"

		  register areas are always required.  The "gca" register area

		  is required if the GCA cache controller is present.

- interrupts:	The interrupt numbers.  The first interrupt is for the hub,

		  while the following interrupts are for the cores.

		  See bindings/interrupt-controller/interrupts.txt

Optional properties:

- clocks:	The core clock the unit runs on

v3d {

	compatible = "brcm,7268-v3d";

	reg = <0xf1204000 0x100>,

	      <0xf1200000 0x4000>,

	      <0xf1208000 0x4000>,

	      <0xf1204100 0x100>;

	reg-names = "bridge", "hub", "core0", "gca";

	interrupts = <0 78 4>,

		     <0 77 4>;

};