usb: r8a66597-hcd: fixup USB_PORT_STAT_C_SUSPEND shift

This is typo fix of
749da5f8 (USB: straighten out port feature vs. port status usage)

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>