dt-bindings: gpu: img,powervr-rogue: Document GX6250 GPU in Renesas R-Car M3-W/M3-W+

dt-bindings: gpu: img,powervr-rogue: Document GX6250 GPU in Renesas R-Car M3-W/M3-W+

Document Imagination Technologies PowerVR Rogue GX6250 BNVC 4.45.2.58
present in Renesas R-Car R8A77960 M3-W and R8A77961 M3-W+ SoC.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Matt Coster <matt.coster@imgtec.com>
Link: https://patch.msgid.link/20251022033847.471106-1-marek.vasut+renesas@mailbox.org
Signed-off-by: Matt Coster <matt.coster@imgtec.com>