USB: ezusb: remove dependancy on usb_serial

This patch removes the dependency on the usb_serial interface and names
some magic constants

Signed-off-by: René Bürgel <rene.buergel@sohard.de>
--
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/serial/keyspan_pda.c b/drivers/usb/serial/keyspan_pda.c
index a4ac3cf..1290b6f 100644
--- a/drivers/usb/serial/keyspan_pda.c
+++ b/drivers/usb/serial/keyspan_pda.c
@@ -682,7 +682,7 @@
 	const struct firmware *fw;
 
 	/* download the firmware here ... */
-	response = ezusb_set_reset(serial, 1);
+	response = ezusb_set_reset(serial->dev, 1);
 
 	if (0) { ; }
 #ifdef KEYSPAN
@@ -707,7 +707,7 @@
 	record = (const struct ihex_binrec *)fw->data;
 
 	while (record) {
-		response = ezusb_writememory(serial, be32_to_cpu(record->addr),
+		response = ezusb_writememory(serial->dev, be32_to_cpu(record->addr),
 					     (unsigned char *)record->data,
 					     be16_to_cpu(record->len), 0xa0);
 		if (response < 0) {
@@ -722,7 +722,7 @@
 	release_firmware(fw);
 	/* bring device out of reset. Renumeration will occur in a moment
 	   and the new device will bind to the real driver */
-	response = ezusb_set_reset(serial, 0);
+	response = ezusb_set_reset(serial->dev, 0);
 
 	/* we want this device to fail to have a driver assigned to it. */
 	return 1;