Grant USB device permission by using system permission.

Previously it skips the device permission check by referring package
name. The CL removes the special case and use general MANAGE_USB
system-only permission to skip USB device permission dialog.

BUG=26048722

Change-Id: I3702393a50696209499d1e5f6549dab9fb2cefe4
diff --git a/packages/MtpDocumentsProvider/AndroidManifest.xml b/packages/MtpDocumentsProvider/AndroidManifest.xml
index 3861d78..d6042a1 100644
--- a/packages/MtpDocumentsProvider/AndroidManifest.xml
+++ b/packages/MtpDocumentsProvider/AndroidManifest.xml
@@ -3,6 +3,7 @@
           package="com.android.mtp"
           android:sharedUserId="android.media">
     <uses-feature android:name="android.hardware.usb.host" />
+    <uses-permission android:name="android.permission.MANAGE_USB" />
     <application android:label="@string/app_label">
         <provider
             android:name=".MtpDocumentsProvider"