ARM: dts: aspeed: Add AST2600 VUARTs

The AST2600 has two more vuarts, placed between the existing two in the
memory map.

Link: https://lore.kernel.org/r/20230620042257.73665-1-joel@jms.id.auSigned-off-by: Joel Stanley <joel@jms.id.au>

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

@@ -729,6 +729,16 @@ vuart1: serial@1e787000 {
 				status = "disabled";
 			};
 
+			vuart3: serial@1e787800 {
+				compatible = "aspeed,ast2500-vuart";
+				reg = <0x1e787800 0x40>;
+				reg-shift = <2>;
+				interrupts = <GIC_SPI 180 IRQ_TYPE_LEVEL_HIGH>;
+				clocks = <&syscon ASPEED_CLK_APB2>;
+				no-loopback-test;
+				status = "disabled";
+			};
+
 			vuart2: serial@1e788000 {
 				compatible = "aspeed,ast2500-vuart";
 				reg = <0x1e788000 0x40>;
@@ -739,6 +749,16 @@ vuart2: serial@1e788000 {
 				status = "disabled";
 			};
 
+			vuart4: serial@1e788800 {
+				compatible = "aspeed,ast2500-vuart";
+				reg = <0x1e788800 0x40>;
+				reg-shift = <2>;
+				interrupts = <GIC_SPI 181 IRQ_TYPE_LEVEL_HIGH>;
+				clocks = <&syscon ASPEED_CLK_APB2>;
+				no-loopback-test;
+				status = "disabled";
+			};
+
 			uart2: serial@1e78d000 {
 				compatible = "ns16550a";
 				reg = <0x1e78d000 0x20>;