[SERIAL] Fix moxa tty driver name

The moxa driver was named "ttya", which is wrong:
1) Documentation/devices.txt says that the name should be "ttyMX".
2) First 10 ports (ttya0...ttya9) clash with the legacy pty driver.

This patch changes the driver name to "ttyMX".

http://bugme.osdl.org/show_bug.cgi?id=5012

Signed-off-by: Sergey Vlasov <vsu@altlinux.ru>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

drivers/char/moxa.c

@@ -339,7 +339,7 @@ static int __init moxa_init(void)
 
 	init_MUTEX(&moxaBuffSem);
 	moxaDriver->owner = THIS_MODULE;
-	moxaDriver->name = "ttya";
+	moxaDriver->name = "ttyMX";
 	moxaDriver->devfs_name = "tts/a";
 	moxaDriver->major = ttymajor;
 	moxaDriver->minor_start = 0;