Rename data/pkg_staging to data/app-staging.

Test: atest apex_e2e_tests
Bug: 126330086

Change-Id: Ic5729d60046e8825a2a94e3c3483ea8232a69ed2
Merged-In: Ic5729d60046e8825a2a94e3c3483ea8232a69ed2
diff --git a/rootdir/init.rc b/rootdir/init.rc
index b769b94..399424b 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -424,7 +424,7 @@
     mkdir /data/apex/active 0750 root system
     mkdir /data/apex/backup 0700 root system
     mkdir /data/apex/sessions 0700 root system
-    mkdir /data/pkg_staging 0750 system system
+    mkdir /data/app-staging 0750 system system
     start apexd
 
     # Avoid predictable entropy pool. Carry over entropy from previous boot.