ARM: dts: aspeed: Add GFX node to AST2600

The GFX device is present in the AST2600 SoC.
Signed-off-by: NJoel Stanley <joel@jms.id.au>
Signed-off-by: NTommy Haung <tommy_huang@aspeedtech.com>
Reviewed-by: NJoel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20220302024930.18758-2-tommy_huang@aspeedtech.comSigned-off-by: NJoel Stanley <joel@jms.id.au>

arch/arm/boot/dts/aspeed-g6.dtsi

@@ -366,6 +366,17 @@
 				quality = <100>;
 			};
 
+			gfx: display@1e6e6000 {
+				compatible = "aspeed,ast2600-gfx", "syscon";
+				reg = <0x1e6e6000 0x1000>;
+				reg-io-width = <4>;
+				clocks = <&syscon ASPEED_CLK_GATE_D1CLK>;
+				resets = <&syscon ASPEED_RESET_GRAPHICS>;
+				syscon = <&syscon>;
+				status = "disabled";
+				interrupts = <GIC_SPI 14 IRQ_TYPE_LEVEL_HIGH>;
+			};
+
 			xdma: xdma@1e6e7000 {
 				compatible = "aspeed,ast2600-xdma";
 				reg = <0x1e6e7000 0x100>;