ARM: dts: rockchip: Add alternate UART pins to rv1126

Add uart3m2_xfer and uart4m2_xfer pins for Rockchip RV1126. These are
used as serial ports for the indicator and Zigbee radio on the iHost.
Signed-off-by: Tim Lunn <tim@feathertop.org>
Link: https://lore.kernel.org/r/20231203124004.2676174-2-tim@feathertop.orgSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rockchip/rv1126-pinctrl.dtsi

@@ -263,6 +263,14 @@ uart3m0_xfer: uart3m0-xfer {
 				/* uart3_tx_m0 */
 				<3 RK_PC6 4 &pcfg_pull_up>;
 		};
+		/omit-if-no-ref/
+		uart3m2_xfer: uart3m2-xfer {
+			rockchip,pins =
+				/* uart3_rx_m2 */
+				<3 RK_PA1 4 &pcfg_pull_up>,
+				/* uart3_tx_m2 */
+				<3 RK_PA0 4 &pcfg_pull_up>;
+		};
 	};
 	uart4 {
 		/omit-if-no-ref/
@@ -273,6 +281,14 @@ uart4m0_xfer: uart4m0-xfer {
 				/* uart4_tx_m0 */
 				<3 RK_PA4 4 &pcfg_pull_up>;
 		};
+		/omit-if-no-ref/
+		uart4m2_xfer: uart4m2-xfer {
+			rockchip,pins =
+				/* uart4_rx_m2 */
+				<1 RK_PD4 3 &pcfg_pull_up>,
+				/* uart4_tx_m2 */
+				<1 RK_PD5 3 &pcfg_pull_up>;
+		};
 	};
 	uart5 {
 		/omit-if-no-ref/