powertop: Build for arm64 too

Change-Id: I6de4df6c90e551795fc117a906f550f03a4bdfa4
diff --git a/Android.mk b/Android.mk
index 09c4205..0ac391e 100644
--- a/Android.mk
+++ b/Android.mk
@@ -1,4 +1,4 @@
-ifeq ($(TARGET_ARCH),arm)
+ifeq ($(call match-word-in-list,$(TARGET_ARCH),arm arm64),true)
 
 LOCAL_PATH := $(call my-dir)