No need to declare minSdkVersion for Settings app.

Change-Id: I2b221ed2bb410578e57475dbbe0106826bfc3f76
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 90d8793..ed22f55 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -4,9 +4,6 @@
         coreApp="true"
         android:sharedUserId="android.uid.system">
 
-    <uses-sdk
-        android:minSdkVersion="21" />
-
     <original-package android:name="com.android.settings" />
 
     <uses-permission android:name="android.permission.WRITE_MEDIA_STORAGE" />