x86 setup: add note to use edd=off on EDD probing hangs

Tell the user to specify edd=off in the case of EDD probing hangs.
Per LKML discussion.
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

arch/x86/boot/edd.c

@@ -154,7 +154,7 @@ void query_edd(void)
 	 */
 
 	if (!be_quiet)
-		printf("Probing EDD... ");
+		printf("Probing EDD (edd=off to disable)... ");
 
 	for (devno = 0x80; devno < 0x80+EDD_MBR_SIG_MAX; devno++) {
 		/*