MIPS: VR5500: Enable prefetch

Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi@necel.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c
index c43f4b2..871e828 100644
--- a/arch/mips/mm/c-r4k.c
+++ b/arch/mips/mm/c-r4k.c
@@ -780,7 +780,7 @@
 		c->dcache.ways = 2;
 		c->dcache.waybit = 0;
 
-		c->options |= MIPS_CPU_CACHE_CDEX_P;
+		c->options |= MIPS_CPU_CACHE_CDEX_P | MIPS_CPU_PREFETCH;
 		break;
 
 	case CPU_TX49XX: