ide: remove stale comment from ide-lib.c

#include <asm/uaccess.h>

#include <asm/io.h>

/*

 *	IDE library routines. These are plug in code that most 

 *	drivers can use but occasionally may be weird enough

 *	to want to do their own thing with

 *

 *	Add common non I/O op stuff here. Make sure it has proper

 *	kernel-doc function headers or your patch will be rejected

 */

static const char *udma_str[] =

	 { "UDMA/16", "UDMA/25",  "UDMA/33",  "UDMA/44",

	   "UDMA/66", "UDMA/100", "UDMA/133", "UDMA7" };