Added 4K quirks for Corsair Neutron GTX SSD's
Correct programming of XXX_MAXP register. This register is 16-bit wide
and not 8-bit. Fix support for isochronous transfers in USB host mode.
Fix a whitespace while at it.

MFC after:	1 week
Reported by:	SAITOU Toshihide <toshi@ruby.ocn.ne.jp>
PR:		usb/181987