[SCSI] ps3rom: disable clustering

ps3rom does:

scsi_for_each_sg(cmd, sgpnt, scsi_sg_count(cmd), k) {
	kaddr = kmap_atomic(sg_page(sgpnt), KM_IRQ0);

We cannot do something like that with the clustering enabled (or we
can use scsi_kmap_atomic_sg).

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

drivers/scsi/ps3rom.c

@@ -427,7 +427,7 @@ static struct scsi_host_template ps3rom_host_template = {
 	.cmd_per_lun =		1,
 	.emulated =             1,		/* only sg driver uses this */
 	.max_sectors =		PS3ROM_MAX_SECTORS,
-	.use_clustering =	ENABLE_CLUSTERING,
+	.use_clustering =	DISABLE_CLUSTERING,
 	.module =		THIS_MODULE,
 };