Add rules for an unix domain socket for system_server

System_server will listen on incoming packets from zygotes.

Bug: 136036078
Test: atest CtsAppExitTestCases:ActivityManagerAppExitInfoTest
Change-Id: I42feaa317615b90c5277cd82191e677548888a71
diff --git a/private/file_contexts b/private/file_contexts
index 560d190..96fd35b 100644
--- a/private/file_contexts
+++ b/private/file_contexts
@@ -465,6 +465,7 @@
 /data/backup(/.*)?		u:object_r:backup_data_file:s0
 /data/secure/backup(/.*)?	u:object_r:backup_data_file:s0
 /data/system/ndebugsocket	u:object_r:system_ndebug_socket:s0
+/data/system/unsolzygotesocket  u:object_r:system_unsolzygote_socket:s0
 /data/drm(/.*)?		u:object_r:drm_data_file:s0
 /data/resource-cache(/.*)? u:object_r:resourcecache_data_file:s0
 /data/dalvik-cache(/.*)? u:object_r:dalvikcache_data_file:s0