Allow the shell to set USB functions.

Bug: 25596495
Test: Issed a shell command and saw it handled correctly
Change-Id: I4472464a1c7ed100cb257dbad83d1d8cfef88fc6
diff --git a/packages/Shell/AndroidManifest.xml b/packages/Shell/AndroidManifest.xml
index 227d0e9..4f7a826 100644
--- a/packages/Shell/AndroidManifest.xml
+++ b/packages/Shell/AndroidManifest.xml
@@ -41,6 +41,7 @@
     <uses-permission android:name="android.permission.EXPAND_STATUS_BAR" />
     <uses-permission android:name="android.permission.DISABLE_KEYGUARD" />
     <uses-permission android:name="android.permission.MANAGE_NETWORK_POLICY" />
+    <uses-permission android:name="android.permission.MANAGE_USB" />
     <!-- System tool permissions granted to the shell. -->
     <uses-permission android:name="android.permission.REAL_GET_TASKS" />
     <uses-permission android:name="android.permission.CHANGE_CONFIGURATION" />