msm_otg: hack to allow externally powered usb host mode - from gearslam/Ak-xGenesis-gee-MHL

ziddey on 2 Jan

https://github.com/gearslam/Ak-xGenesis-gee-MHL/blob/34b58d6efcfd153f9817164078e2be90b702f35b/drivers/usb/otg/msm_otg.c