[incfs] Allow everyone read the IncFS sysfs features

Every process needs to be able to determine the IncFS features
to choose the most efficient APIs to call

Bug: 184357957
Test: build + atest PackageManagerShellCommandTest
Change-Id: Ia84e3fecfd7be1209af076452cc27cc68aefd80d
diff --git a/private/isolated_app.te b/private/isolated_app.te
index 94d60f0..71749c0 100644
--- a/private/isolated_app.te
+++ b/private/isolated_app.te
@@ -128,6 +128,7 @@
   -sysfs_devices_system_cpu
   -sysfs_transparent_hugepage
   -sysfs_usb # TODO: check with audio team if needed for isolated_app (b/28417852)
+  -sysfs_fs_incfs_features
 }:file no_rw_file_perms;
 
 # No creation of sockets families other than AF_UNIX sockets.