Add sepolicy for persist.nfc_cfg.

Add a new nfc_cfg persist property for nfc features

Bug: 142626304
Test: set property and load target files.
Change-Id: I853c97e8113dbcf729cf59ad45895402b0c82b3e
diff --git a/private/property_contexts b/private/property_contexts
index b2b6abc..294bb9a 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -51,6 +51,7 @@
 
 persist.audio.          u:object_r:audio_prop:s0
 persist.bluetooth.      u:object_r:bluetooth_prop:s0
+persist.nfc_cfg.        u:object_r:nfc_prop:s0
 persist.debug.          u:object_r:persist_debug_prop:s0
 persist.logd.           u:object_r:logd_prop:s0
 ro.logd.                u:object_r:logd_prop:s0