Add Mips memset speedup

Change-Id: I157aa8b500e271c213bf615dd4ceb25b3aedd7c2
diff --git a/libcutils/Android.mk b/libcutils/Android.mk
index a9c7981..ac07d9b 100644
--- a/libcutils/Android.mk
+++ b/libcutils/Android.mk
@@ -132,7 +132,11 @@
 LOCAL_CFLAGS += -DHAVE_MEMSET16 -DHAVE_MEMSET32
 LOCAL_SRC_FILES += arch-x86/android_memset16.S arch-x86/android_memset32.S memory.c
 else # !x86-atom
+ifeq ($(TARGET_ARCH),mips)
+LOCAL_SRC_FILES += arch-mips/android_memset.c
+else # !mips
 LOCAL_SRC_FILES += memory.c
+endif # !mips
 endif # !x86-atom
 endif # !arm