ARM: tegra: enable USB device mode and UMS on some boards

For each of Jetson TK1, Venice2, and Beaver:

- Enable the first USB controller in DT, and describe its configuration.

- Enable USB device/gadget support. This allows the user to type e.g.
  "ums 0 mmc 0" at the command-line to cause U-Boot to act a USB device
  implementing the USB Mass Storage protocol, and expose MMC device 0
  that way.

This allows a host PC to mount the Tegra device's MMC, partition it, and
install a filesystem on it.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/include/configs/venice2.h b/include/configs/venice2.h
index 2d75f50..c4a1b94 100644
--- a/include/configs/venice2.h
+++ b/include/configs/venice2.h
@@ -63,6 +63,7 @@
 /* USB Host support */
 #define CONFIG_USB_EHCI
 #define CONFIG_USB_EHCI_TEGRA
+#define CONFIG_USB_MAX_CONTROLLER_COUNT	2
 #define CONFIG_USB_STORAGE
 #define CONFIG_CMD_USB
 
@@ -74,6 +75,7 @@
 #define CONFIG_CMD_NET
 #define CONFIG_CMD_DHCP
 
+#include "tegra-common-ums.h"
 #include "tegra-common-post.h"
 
 #endif /* __CONFIG_H */