ARM: DT: APQ8064: Add node for ps_hold function in pinctrl

This patch adds DT support to configure GPIO_78 as function ps_hold
on apq8064.

CC: Rob Herring <robh+dt@kernel.org>
CC: Pawel Moll <pawel.moll@arm.com>
CC: Mark Rutland <mark.rutland@arm.com>
CC: Ian Campbell <ijc+devicetree@hellion.org.uk>
CC: Kumar Gala <galak@codeaurora.org>
CC: devicetree@vger.kernel.org
CC: linux-arm-kernel@lists.infradead.org
Signed-off-by: Pramod Gurav <pramod.gurav@smartplayin.com>
Signed-off-by: Kumar Gala <galak@codeaurora.org>

arch/arm/boot/dts/qcom-apq8064.dtsi

@@ -80,6 +80,16 @@ tlmm_pinmux: pinctrl@800000 {
 			interrupt-controller;
 			#interrupt-cells = <2>;
 			interrupts = <0 16 IRQ_TYPE_LEVEL_HIGH>;
+
+			pinctrl-names = "default";
+			pinctrl-0 = <&ps_hold>;
+
+			ps_hold: ps_hold {
+				mux {
+					pins = "gpio78";
+					function = "ps_hold";
+				};
+			};
 		};
 
 		intc: interrupt-controller@2000000 {