Add system feature for Companion Device Manager

Bug: 30932767
Test: Add just the feature gating first, ensure Context#getSystemSetrvice now
returns null.
Add feature in the configuration files, ensure companion device feature works again.
Change-Id: I4ad2d52f7877eae0e951f43ddbb23881d5de8d8b
diff --git a/data/etc/handheld_core_hardware.xml b/data/etc/handheld_core_hardware.xml
index 467e0fd..4d7a30a 100644
--- a/data/etc/handheld_core_hardware.xml
+++ b/data/etc/handheld_core_hardware.xml
@@ -44,6 +44,7 @@
     <feature name="android.software.input_methods" />
     <feature name="android.software.picture_in_picture" />
     <feature name="android.software.print" />
+    <feature name="android.software.companion_device_setup" />
 
     <!-- Feature to specify if the device supports adding device admins. -->
     <feature name="android.software.device_admin" />