ARM: tegra: add usb_vbus entry for OTG driver

ARM: tegra: add usb_vbus entry for OTG driver

If USB port has OTG support, allow the OTG driver
to control the vbus. Adding the usb_vbus entry
for OTG driver.

Bug 934024

Change-Id: I86253d145a6ff966e7a4e50deee695efe8545b88
Signed-off-by: Rakesh Bodla <rbodla@nvidia.com>
Reviewed-on: http://git-master/r/239340
(cherry picked from commit 1e550fe0c2df52668af16b5b1fcff0a83d1f2466)
Reviewed-on: http://git-master/r/247150
Reviewed-by: Simone Willett <swillett@nvidia.com>
Tested-by: Simone Willett <swillett@nvidia.com>