usb: gadget: tegra: Update extcon state properly

usb: gadget: tegra: Update extcon state properly

If USB cable is disconnected when the device is in LP0,
after resuming current limit is set to 0 and accordingly
extcon state must be updated with which charger icon
also gets updated.

Bug 1502977

Change-Id: I171df607d3190191cf821a5b03f93d52cfa25e93
Signed-off-by: Rohith Seelaboyina <rseelaboyina@nvidia.com>
Reviewed-on: http://git-master/r/406423
(cherry picked from commit 370c32eae5d11419bb48f6ce2f6d8a37a7d7b8b6)
Reviewed-on: http://git-master/r/409576
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Venkat Moganty <vmoganty@nvidia.com>