DeviceParts: use OmniPreferenceTheme for material switch style

Change-Id: I1fa890b7874fe038b0b367cc76752a075297e67f
diff --git a/DeviceParts/Android.bp b/DeviceParts/Android.bp
index 2bed802..ee53db2 100644
--- a/DeviceParts/Android.bp
+++ b/DeviceParts/Android.bp
@@ -10,6 +10,7 @@
         "androidx.preference_preference",
         "com.google.android.material_material",
         "OmniLib",
+        "OmniPreferenceTheme",
     ],
 
     srcs: [