Add missing arch_mips

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/arch/arch.h b/arch/arch.h
index 4ad49a4..3ee5ac4 100644
--- a/arch/arch.h
+++ b/arch/arch.h
@@ -19,6 +19,7 @@
 	arch_arm,
 	arch_sh,
 	arch_hppa,
+	arch_mips,
 
 	arch_generic,