Add sepolicy for installd check sdcardfs usage property

We should add sepolicy for installd to get permission to check for external_storage.sdcardfs.enabled before deciding that the system is using sdcardfs.

Test: Run on device not using sdcardfs, but with sdcardfs present in kernel

Bug: 160727529
Bug: 181819712

Change-Id: I79df67789ab003762337ad4e89e46892990d0e60
diff --git a/public/installd.te b/public/installd.te
index 61c8bce..eb13cfa 100644
--- a/public/installd.te
+++ b/public/installd.te
@@ -157,6 +157,9 @@
 # Allow installd to read /proc/filesystems
 allow installd proc_filesystems:file r_file_perms;
 
+#add for move app to sd card
+get_prop(installd, storage_config_prop)
+
 ###
 ### Neverallow rules
 ###