Allow access to /proc/config.gz for priv_app and recovery

Bug: 37485771
Test: sideloaded OTA through recovery on sailfish

Change-Id: I98bb4e0e919db585131391f57545f1a9a0096701
Signed-off-by: Sandeep Patil <sspatil@google.com>
diff --git a/private/priv_app.te b/private/priv_app.te
index bb7598e..065ea1a 100644
--- a/private/priv_app.te
+++ b/private/priv_app.te
@@ -82,6 +82,9 @@
 r_dir_file(priv_app, proc)
 r_dir_file(priv_app, rootfs)
 
+# Allow GMS core to open kernel config for OTA matching through libvintf
+allow priv_app config_gz:file { open read getattr };
+
 # access the mac address
 allowxperm priv_app self:udp_socket ioctl SIOCGIFHWADDR;