musb_hdrc: Minor root hub cleanups

Minor root hub cleanups:

 - Use unaligned accessors to return status, in case usbcore passes
   a buffer that's not aligned.

 - Fix some glitching on restart (e.g. when switching gadget drivers
   while leaving the OTG-mode musb_hdrc driver loaded).

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

diff --cc drivers/usb/musb/musb_host.c
Simple merge

diff --cc drivers/usb/musb/virthub.c
Simple merge