usb: gadget: otg:Modify Y-cable charging cur limit

Modify the OTG Y-cable charging current limit
from 500mA to 1200mA.

Bug 1375608

Change-Id: I7e6dc93e3f73dd7cc5e8ed9d9c6c8055cf7df78d
Signed-off-by: Rakesh Bodla <rbodla@nvidia.com>
Reviewed-on: http://git-master/r/376435
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Venkat Moganty <vmoganty@nvidia.com>