USB: move help config flag to FW

Note: This cl is copied from aosp/1785174 since
merge conflict issue.

Move the flag for the indication of the validity of help links
to framework because it is also needed for SystemUI.

config_has_help will be replaced by config_settingsHelpLinksEnabled
in frameworks.

Test: $ adb shell dumpsys usb add-port "matrix" ufp
$ adb shell dumpsys usb set-contaminant-status "matrix" true
Bug: 195448626

Change-Id: Id9b0c196c9a07085c790d5f4366bb1fec635d6b1

AndroidManifest.xml

@@ -3882,7 +3882,7 @@
             android:theme="@style/Transparent"
             android:permission="android.permission.DUMP"
             android:excludeFromRecents="true"
-            android:enabled="@bool/config_has_help" />
+            android:enabled="@*android:bool/config_settingsHelpLinksEnabled" />
 
         <activity android:name=".applications.autofill.AutofillPickerActivity"
                 android:excludeFromRecents="true"

res/values/config.xml

@@ -312,9 +312,6 @@
     <!-- Whether swipe security option is hidden or not -->
     <bool name="config_hide_swipe_security_option">false</bool>
 
-    <!--Whether help links are defined. -->
-    <bool name="config_has_help">false</bool>
-
     <!-- Whether Wi-Fi settings should be shown or not.
     This also controls whether Wi-fi related sub-settings (e.g. Wi-Fi preferences) will
     surface in search results or not.-->