Settings: Add toggle for Lockscreen Media Art

* Allows to choose whether or not to show album art/media art on lockscreen

Change-Id: Ieea583a0e42c317e1651ecaba66ac07c02934250
diff --git a/res/values/cm_strings.xml b/res/values/cm_strings.xml
index b382a3a..9dc6da8 100644
--- a/res/values/cm_strings.xml
+++ b/res/values/cm_strings.xml
@@ -45,6 +45,9 @@
     <string name="increasing_ring_min_volume_title">Start volume</string>
     <string name="increasing_ring_ramp_up_time_title">Ramp-up time</string>
 
+    <!-- Lock screen cover art -->
+    <string name="lockscreen_media_art_title">Display media cover art</string>
+
     <!-- Lock screen pattern size -->
     <string name="lock_pattern_size_3" translatable="false">3 \u00d7 3</string>
     <string name="lock_pattern_size_4" translatable="false">4 \u00d7 4</string>