usb: musb: Remove duplicate declaration of functions

Remove duplicate declaration of below functions in musb_host.h
	musb_host_cleanup
	musb_host_tx
	musb_host_rx
	musb_root_disconnect

Signed-off-by: Saurav Girepunje <saurav.girepunje@gmail.com>
Link: https://lore.kernel.org/r/20210508093512.GA11194@user


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>