USB: musb: Remove unused inline function

It is never used, so can remove it.

Signed-off-by: YueHaibing <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/musb/musb_host.h

···
 static inline void musb_host_rx(struct musb *musb, u8 epnum)	{}
 static inline void musb_root_disconnect(struct musb *musb)	{}
 static inline void musb_host_resume_root_hub(struct musb *musb)	{}
-static inline void musb_host_poll_rh_status(struct musb *musb)	{}
 static inline void musb_host_poke_root_hub(struct musb *musb)	{}
 static inline int musb_port_suspend(struct musb *musb, bool do_suspend)
 {