flo: Add support for USB OTG

Conflicts:
	fstab.flo
	init.flo.rc
	overlay/frameworks/base/core/res/res/xml/storage_list.xml

Change-Id: Id5ded1d14f01e4bd126115866e0bf3bd75d5cfcb
Signed-off-by: Xiao-Long Chen <chenxiaolong@cxl.epac.to>