Set host_request_flag if the current peripheral wants to take host role
via changing a_bus_req or b_bus_req by user application.
Acked-by: NPeter Chen <peter.chen@freescale.com>
Signed-off-by: NLi Jun <jun.li@nxp.com>
Signed-off-by: NFelipe Balbi <balbi@kernel.org>