ARM: tegra: convert device tree files to use GPIO defines

Use TEGRA_GPIO() macro to name all GPIOs referenced by GPIO properties,
and some interrupts properties. Use standard GPIO flag defines too.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
diff --git a/arch/arm/boot/dts/tegra20-iris-512.dts b/arch/arm/boot/dts/tegra20-iris-512.dts
index 9de10a2..f2222bd 100644
--- a/arch/arm/boot/dts/tegra20-iris-512.dts
+++ b/arch/arm/boot/dts/tegra20-iris-512.dts
@@ -80,7 +80,7 @@
 			regulator-max-microvolt = <5000000>;
 			regulator-boot-on;
 			regulator-always-on;
-			gpio = <&gpio 178 0>;
+			gpio = <&gpio TEGRA_GPIO(W, 2) GPIO_ACTIVE_HIGH>;
 		};
 
 		vcc_sd_reg: regulator@1 {