Foldable auto-rotation: Add support for rear display device state

Bug: 279014881
Test: atest SettingsLibTests:com.android.settingslib.devicestate.PosturesHelperTest
Change-Id: I37a43740d5940f1bae208e36f289f9d3e3dc85f5
diff --git a/packages/SettingsLib/tests/integ/Android.bp b/packages/SettingsLib/tests/integ/Android.bp
index d463170..ff3eeec 100644
--- a/packages/SettingsLib/tests/integ/Android.bp
+++ b/packages/SettingsLib/tests/integ/Android.bp
@@ -30,7 +30,10 @@
 
     certificate: "platform",
 
-    srcs: ["src/**/*.java"],
+    srcs: [
+        "src/**/*.java",
+        "src/**/*.kt",
+    ],
 
     libs: [
         "android.test.runner",