Add new res for small screens in avatar picker

This CL adds a dimens file for smaller screens to avoid the avatar
picker images being cropped.

Screenshot: https://screenshot.googleplex.com/4AcJTr3TTDJ3yc4.png

Bug: 238380225
Test: manual check screen on various screen sizes
Change-Id: I84478030145cadb9930989f0c077f2343fe36fe1

packages/SettingsLib/res/values-w320dp-port/dimens.xml

@@ -0,0 +1,21 @@
+<!--
+    Copyright (C) 2022 The Android Open Source Project
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+         http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+  -->
+<resources>
+    <integer name="avatar_picker_columns">2</integer>
+    <dimen name="avatar_size_in_picker">96dp</dimen>
+    <dimen name="avatar_picker_padding">6dp</dimen>
+    <dimen name="avatar_picker_margin">2dp</dimen>
+</resources>