microblaze: Enable hardware exception by default

Enable hardware exception by default to be able to
handle it.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/microblaze/cpu/start.S b/arch/microblaze/cpu/start.S
index 1757bbf..f466031 100644
--- a/arch/microblaze/cpu/start.S
+++ b/arch/microblaze/cpu/start.S
@@ -130,7 +130,7 @@
 
 	/* enable instruction and data cache */
 	mfs	r12, rmsr
-	ori	r12, r12, 0xa0
+	ori	r12, r12, 0x1a0
 	mts	rmsr, r12
 
 clear_bss: