usb: gadget: tegra: check vbus before run bit set

usb: gadget: tegra: check vbus before run bit set

Adding the check for vbus before setting the
run bit.

Bug 1046443

Reviewed-on: http://git-master/r/131733
(cherry picked from commit e2dcc0fff0bde89eced1482f3df763bfc7afd3a2)

Change-Id: Ie88ad2ab60b0e8c7691d5b66e52f9ee6c19d34fa
Signed-off-by: Rohith Seelaboyina <rseelaboyina@nvidia.com>
Reviewed-on: http://git-master/r/132210
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Venkata Jagadish <vjagadish@nvidia.com>
Reviewed-by: Rakesh Bodla <rbodla@nvidia.com>
Reviewed-by: Venkat Moganty <vmoganty@nvidia.com>
Rebase-Id: R6414284b141a301c4d20df288f247a367ee9eaef