Define SOC sysprop policy

BUG: 158284209
Test: atest android.os.cts.BuildTest
Change-Id: I7df7e575072c37ca379b97f60cc6c0850a02bcd1
diff --git a/private/property_contexts b/private/property_contexts
index 6b2b883..7409d10 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -1097,3 +1097,7 @@
 db.log.detailed              u:object_r:sqlite_log_prop:s0 exact bool
 db.log.slow_query_threshold  u:object_r:sqlite_log_prop:s0 exact int
 db.log.slow_query_threshold. u:object_r:sqlite_log_prop:s0 prefix int
+
+# SOC related props
+ro.soc.manufacturer u:object_r:soc_prop:s0 exact string
+ro.soc.model        u:object_r:soc_prop:s0 exact string