USB: add support for SuperH OHCI

add support for SuperH OHCI.

supported CPU are:
 - SH7720
 - SH7721
 - SH7763

Signed-off-by: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
Acked-by: David Brownell <david-b@pacbell.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>