riscv: dts: spacemit: k3: add pinctrl support

Populate pinctrl node in Device Tree for SpacemiT K3 SoC, So devices
can request pinctrl resource properly.

Link: https://lore.kernel.org/r/20260304-01-dts-uart-full-v1-2-50a0aa53a245@kernel.org
Signed-off-by: Yixun Lan <dlan@kernel.org>

Author: Yixun Lan

arch/riscv/boot/dts/spacemit/k3.dtsi

@@ -536,6 +536,14 @@
 			status = "disabled";
 		};
 
+		pinctrl: pinctrl@d401e000 {
+			compatible = "spacemit,k3-pinctrl";
+			reg = <0x0 0xd401e000 0x0 0x1000>;
+			clocks = <&syscon_apbc CLK_APBC_AIB>,
+				 <&syscon_apbc CLK_APBC_AIB_BUS>;
+			clock-names = "func", "bus";
+		};
+
 		uart10: serial@d401f000 {
 			compatible = "spacemit,k3-uart", "intel,xscale-uart";
 			reg = <0x0 0xd401f000 0x0 0x100>;