Staging: Add serqt_usb2, a rewrite of serqt_usb for the usb-serial layer

This is the serqt_usb driver rewritten to use usb-serial.
Signed-off-by: Bill Pemberton <wfp5p@virginia.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/serqt_usb2/Kconfig

+config USB_SERIAL_QUATECH2
+	tristate "USB Quatech ESU-100 8 Port Serial Driver"
+	depends on USB_SERIAL
+	help
+	  Say Y here if you want to use the Quatech ESU-100 8 port usb to
+	  serial adapter.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called serqt_usb2.

drivers/staging/serqt_usb2/Makefile

+obj-$(CONFIG_USB_SERIAL_QUATECH2)		+= serqt_usb2.o