Settings: Remove mainline module info from about device

* We're going to globally flatten apex anyway

Change-Id: I7e36cd98f807345644eb94033a851cb445be408d
diff --git a/res/xml/firmware_version.xml b/res/xml/firmware_version.xml
index a095b14..cc88bc9 100644
--- a/res/xml/firmware_version.xml
+++ b/res/xml/firmware_version.xml
@@ -58,14 +58,6 @@
         settings:enableCopying="true"
         settings:controller="com.android.settings.deviceinfo.firmwareversion.LeafVendorSecurityPatchLevelPreferenceController"/>
 
-    <!-- Mainline module version -->
-    <Preference
-        android:key="module_version"
-        android:title="@string/module_version"
-        android:summary="@string/summary_placeholder"
-        settings:enableCopying="true"
-        settings:controller="com.android.settings.deviceinfo.firmwareversion.MainlineModuleVersionPreferenceController"/>
-
     <!-- Baseband -->
     <Preference
         android:key="base_band"