Bump targetSdkVersion to 24

This will only affect AOSP build.

BUG:28621267
Change-Id: Ic47567cb950fa8a43cb244182ae035d140dda97c
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 6f7a444..77d8fbb 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -10,7 +10,7 @@
     android:versionCode="1"
     android:versionName="1.0" >
 
-    <uses-sdk android:minSdkVersion="19" android:targetSdkVersion="23" />
+    <uses-sdk android:minSdkVersion="19" android:targetSdkVersion="24" />
 
     <!-- "Normal" permissions which do not require user prompt -->
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />