Add external_storage properties.

Since these need to be set from a vendor context.

Bug: 152170470
Bug: 153525566
Test: N/A
Change-Id: I2e90ad08fa0a5bd2b4759d92f95d35cec2b316df
diff --git a/private/recovery.te b/private/recovery.te
index eee1698..b522230 100644
--- a/private/recovery.te
+++ b/private/recovery.te
@@ -20,5 +20,8 @@
   # Read ro.boot.bootreason
   get_prop(recovery, bootloader_boot_reason_prop)
 
+  # Read storage properties (for correctly formatting filesystems)
+  get_prop(recovery, storage_config_prop)
+
   set_prop(recovery, gsid_prop)
 ')