ARM: DT: tegra114: add pinmux DT entry

Add DT entry for pinmux and drive configuration addresses.
Signed-off-by: NLaxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: NStephen Warren <swarren@nvidia.com>

arch/arm/boot/dts/tegra114.dtsi

@@ -54,6 +54,12 @@
 		interrupt-controller;
 	};
 
+	pinmux: pinmux {
+		compatible = "nvidia,tegra114-pinmux";
+		reg = <0x70000868 0x148		/* Pad control registers */
+		       0x70003000 0x40c>;	/* Mux registers */
+	};
+
 	serial@70006000 {
 		compatible = "nvidia,tegra114-uart", "nvidia,tegra20-uart";
 		reg = <0x70006000 0x40>;