Remove the call log backup agent icon

Bug: 110177366
Test: Verified that Call Log Backup/Restore has the default icon under Settings > Apps & Notifications > App info

Change-Id: Icffcf8cd32ceb7eaeb13f39bf61d75be0410c3da
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 063c1d1..d8678d2 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -6,7 +6,6 @@
     <uses-permission android:name="android.permission.QUERY_ALL_PACKAGES" />
 
     <application android:label="@string/app_label"
-        android:icon="@drawable/app_icon"
         android:allowBackup="true"
         android:backupAgent="CallLogBackupAgent"
         android:usesCleartextTraffic="false">
diff --git a/res/drawable-hdpi/app_icon.png b/res/drawable-hdpi/app_icon.png
deleted file mode 100644
index 64eff00..0000000
--- a/res/drawable-hdpi/app_icon.png
+++ /dev/null
Binary files differ
diff --git a/res/drawable-mdpi/app_icon.png b/res/drawable-mdpi/app_icon.png
deleted file mode 100644
index b4ee821..0000000
--- a/res/drawable-mdpi/app_icon.png
+++ /dev/null
Binary files differ
diff --git a/res/drawable-xhdpi/app_icon.png b/res/drawable-xhdpi/app_icon.png
deleted file mode 100644
index 6feeadf..0000000
--- a/res/drawable-xhdpi/app_icon.png
+++ /dev/null
Binary files differ