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

Use key code macros for all key code refernced for keys.

For tegra20-seaboard.dts and tegra20-harmony.dts:
  The key comment for key (16th row and 1st column) is KEY_KPSLASH but
  code is 0x004e which is the key code for KEY_KPPLUS. As there other
  key exist with KY_KPPLUS, I am assuming key code is wrong and comment
  is fine. With this assumption, I am keeping the key code as KEY_KPSLASH.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
diff --git a/arch/arm/boot/dts/tegra20-whistler.dts b/arch/arm/boot/dts/tegra20-whistler.dts
index 82037fe..00ba97a 100644
--- a/arch/arm/boot/dts/tegra20-whistler.dts
+++ b/arch/arm/boot/dts/tegra20-whistler.dts
@@ -1,5 +1,6 @@
 /dts-v1/;
 
+#include <dt-bindings/input/input.h>
 #include "tegra20.dtsi"
 
 / {
@@ -502,10 +503,10 @@
 		nvidia,kbc-row-pins = <0 1 2>;
 		nvidia,kbc-col-pins = <16 17>;
 		nvidia,wakeup-source;
-		linux,keymap = <0x00000074	/* KEY_POWER */
-				0x01000066	/* KEY_HOME */
-				0x0101009E	/* KEY_BACK */
-				0x0201008B>;	/* KEY_MENU */
+		linux,keymap = <MATRIX_KEY(0x00, 0x00, KEY_POWER)
+				MATRIX_KEY(0x01, 0x00, KEY_HOME)
+				MATRIX_KEY(0x01, 0x01, KEY_BACK)
+				MATRIX_KEY(0x02, 0x01, KEY_MENU)>;
 	};
 
 	pmc@7000e400 {