Rename data/pkg_staging to data/app-staging

Test: atest apex_e2e_tests
Bug: 126330086

Change-Id: I757a7f97bf8cbb4828596ce903630c505a2ddacc
diff --git a/core/java/android/os/Environment.java b/core/java/android/os/Environment.java
index 0aed981..aed6bc9a 100644
--- a/core/java/android/os/Environment.java
+++ b/core/java/android/os/Environment.java
@@ -388,7 +388,7 @@
 
     /** {@hide} */
     public static File getDataStagingDirectory(String volumeUuid) {
-        return new File(getDataDirectory(volumeUuid), "pkg_staging");
+        return new File(getDataDirectory(volumeUuid), "app-staging");
     }
 
     /** {@hide} */