Revert "Revert "Add support for gid derivation on private volumes""

This reverts commit a3a60b372efb48a672848c7797efd57a4ec92303.

Reason for revert: All kernel prebuilts merged

(cherry picked from commit 75ae529bf86c33106e6a716ad054c6eea6deabc5)

Bug: 65600849
Bug: 65573871
Test: m
Change-Id: I75b0cb1d82213b875cbef8d39f4f1a8fb34b9795
diff --git a/EmulatedVolume.cpp b/EmulatedVolume.cpp
index df91904..21b290a 100644
--- a/EmulatedVolume.cpp
+++ b/EmulatedVolume.cpp
@@ -84,6 +84,7 @@
                 "-g", "1023", // AID_MEDIA_RW
                 "-m",
                 "-w",
+                "-G",
                 mRawPath.c_str(),
                 label.c_str(),
                 NULL)) {