Fix SuperSU local dependencies

Change-Id: Ia5fadd8254340b21a54565e2c7d2b54aa70f19f3
diff --git a/prebuilt/Android.mk b/prebuilt/Android.mk
index 8195425..4ea7e71 100644
--- a/prebuilt/Android.mk
+++ b/prebuilt/Android.mk
@@ -374,7 +374,8 @@
 
 		#su binary
 		include $(CLEAR_VARS)
-		LOCAL_MODULE := su
+		LOCAL_MODULE := suarm
+		LOCAL_MODULE_STEM := su
 		LOCAL_MODULE_TAGS := eng
 		LOCAL_MODULE_CLASS := RECOVERY_EXECUTABLES
 		LOCAL_MODULE_PATH := $(TARGET_RECOVERY_ROOT_OUT)/supersu