mmd: add mmd_shared_status_prop

mmd.enabled_aconfig will be referenced by vendor_init at aosp/3472228.
mmd continue to be the only writer of mmd.enabled_aconfig.

Bug: 393481329
Test: manual

Change-Id: I54cbd0cbb948676fca4c885fedc7abcbe8ce8af9
diff --git a/private/property_contexts b/private/property_contexts
index d80931c..8903291 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -1823,5 +1823,5 @@
 # Properties for mmd
 mmd. u:object_r:mmd_prop:s0
 mmd.zram.enabled u:object_r:mmd_shared_prop:s0 exact bool
-mmd.enabled_aconfig u:object_r:mmd_status_prop:s0 exact bool
+mmd.enabled_aconfig u:object_r:mmd_shared_status_prop:s0 exact bool
 mmd.status. u:object_r:mmd_status_prop:s0