Rename data/pkg_staging to data/app-staging

Test: atest apex_e2e_tests
Bug: 126330086

Change-Id: Id98ecbad4f9452bc40a628ceb8c50ce20453d7ad
diff --git a/cmds/installd/globals.cpp b/cmds/installd/globals.cpp
index f52c2e7..1394701 100644
--- a/cmds/installd/globals.cpp
+++ b/cmds/installd/globals.cpp
@@ -44,7 +44,7 @@
 static constexpr const char* PRIVATE_APP_SUBDIR = "app-private/"; // sub-directory under
                                                                   // ANDROID_DATA
 
-static constexpr const char* STAGING_SUBDIR = "pkg_staging/"; // sub-directory under ANDROID_DATA
+static constexpr const char* STAGING_SUBDIR = "app-staging/"; // sub-directory under ANDROID_DATA
 
 std::string android_app_dir;
 std::string android_app_ephemeral_dir;