ARM: dts: OMAP2+: Identify GPIO banks that are always powered

Add the "ti,gpio-always-on" property to the appropriate GPIO banks to
indicate which banks are always powered and will never lose logic state.

Signed-off-by: Jon Hunter <jon-hunter@ti.com>
Signed-off-by: Benoit Cousson <benoit.cousson@linaro.org>
diff --git a/arch/arm/boot/dts/omap4.dtsi b/arch/arm/boot/dts/omap4.dtsi
index 234f2d2..2a56428 100644
--- a/arch/arm/boot/dts/omap4.dtsi
+++ b/arch/arm/boot/dts/omap4.dtsi
@@ -140,6 +140,7 @@
 			reg = <0x4a310000 0x200>;
 			interrupts = <0 29 0x4>;
 			ti,hwmods = "gpio1";
+			ti,gpio-always-on;
 			gpio-controller;
 			#gpio-cells = <2>;
 			interrupt-controller;