Add two missing chipsets to drivers/ide/ide-proc.c

Compiling with '-Wswitch-enum' I noticed following:

  CC      drivers/ide/ide-proc.o
drivers/ide/ide-proc.c: In function ‘proc_ide_read_imodel’:
drivers/ide/ide-proc.c:54: warning: enumeration value ‘ide_etrax100’ not handled in switch
drivers/ide/ide-proc.c:54: warning: enumeration value ‘ide_acorn’ not handled in switch

How about the following patch?
Signed-off-by: NMika Kukkonen <mikukkon@iki.fi>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/ide-proc.c

@@ -67,6 +67,8 @@ static int proc_ide_read_imodel
 		case ide_4drives:	name = "4drives";	break;
 		case ide_pmac:		name = "mac-io";	break;
 		case ide_au1xxx:	name = "au1xxx";	break;
+		case ide_etrax100:	name = "etrax100";	break;
+		case ide_acorn:		name = "acorn";		break;
 		default:		name = "(unknown)";	break;
 	}
 	len = sprintf(page, "%s\n", name);