hammerhead: set persist.sys.isUsbOtgEnabled to enable USB storage.
hammerhead: set persist.sys.isUsbOtgEnabled to enable USB storage.

Change-Id: I7d362fabed21fdb1ee6c579eac56ae7c7bca5a84

maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead