ARM: Tegra: Seaboard: Add USB devices

Seaboard has a couple of external USB ports. Add the platform devices and
GPIO infra-structure to enable these.

I tested both ports with a mouse on Seaboard non-clamshell.

This change is extracted from code in the ChromeOS 2.6.38 kernel.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
diff --git a/arch/arm/mach-tegra/board-seaboard-pinmux.c b/arch/arm/mach-tegra/board-seaboard-pinmux.c
index 7879750..74f78b7 100644
--- a/arch/arm/mach-tegra/board-seaboard-pinmux.c
+++ b/arch/arm/mach-tegra/board-seaboard-pinmux.c
@@ -168,6 +168,7 @@
 	{ .gpio = TEGRA_GPIO_POWERKEY,		.enable = true },
 	{ .gpio = TEGRA_GPIO_ISL29018_IRQ,	.enable = true },
 	{ .gpio = TEGRA_GPIO_CDC_IRQ,		.enable = true },
+	{ .gpio = TEGRA_GPIO_USB1,		.enable = true },
 };
 
 void __init seaboard_pinmux_init(void)