Support multiple users in emulated devices

Enable multi-user support in AVDs. Up to 4 users are allowed.

BUG: 32504505

Test: Manual verification

(cherry picked from commit 9fdf75764946ad20109ca25cff0eaaa6b0acb0be)

Change-Id: I37a5aaa665297e7134d43e832008bea6450a084e
diff --git a/overlay/frameworks/base/core/res/res/values/config.xml b/overlay/frameworks/base/core/res/res/values/config.xml
index bab2237..c40301f 100644
--- a/overlay/frameworks/base/core/res/res/values/config.xml
+++ b/overlay/frameworks/base/core/res/res/values/config.xml
@@ -21,4 +21,10 @@
     <!-- Make this 'true' to allow the Emulator to control
          the state of the headphone/microphone jack -->
     <bool name="config_useDevInputEventForAudioJack">true</bool>
+
+    <!--  Maximum number of supported users -->
+    <integer name="config_multiuserMaximumUsers">4</integer>
+    <!--  Whether Multiuser UI should be shown -->
+    <bool name="config_enableMultiUserUI">true</bool>
+
 </resources>