Make /data/media case insensitive

Use chattr to apply +F to /data/media
This will fail on devices who do not support casefolding on userdata.

Bug: 138322712
Test: /data/media is set to +F.
Change-Id: Ib341c23a0992ee97b23113b3a72f33a61e583b04
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 5f4b8c3..2ee32bd 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -676,10 +676,6 @@
     mkdir /data/user/0 0700 system system encryption=None
     mount none /data/data /data/user/0 bind rec
 
-    # Special-case /data/media/obb per b/64566063
-    mkdir /data/media 0770 media_rw media_rw encryption=None
-    mkdir /data/media/obb 0770 media_rw media_rw encryption=Attempt
-
     # A tmpfs directory, which will contain all apps CE DE data directory that
     # bind mount from the original source.
     chown root root /data_mirror
@@ -717,6 +713,11 @@
     wait_for_prop apexd.status ready
     perform_apex_config
 
+    # Special-case /data/media/obb per b/64566063
+    mkdir /data/media 0770 media_rw media_rw encryption=None
+    exec - media_rw media_rw -- /system/bin/chattr +F /data/media
+    mkdir /data/media/obb 0770 media_rw media_rw encryption=Attempt
+
     exec_start derive_sdk
 
     init_user0