Add wait_for_keymaster

Bug: 79228237
Test: audit2allow finds no relevant denials on boot
Change-Id: Ia80b77ba9a1ec2354127cd0ef68d50ebcf593fb0
diff --git a/private/file_contexts b/private/file_contexts
index 71bff73..3dfb8a6 100644
--- a/private/file_contexts
+++ b/private/file_contexts
@@ -292,6 +292,7 @@
 /system/bin/stats                u:object_r:stats_exec:s0
 /system/bin/statsd               u:object_r:statsd_exec:s0
 /system/bin/bpfloader            u:object_r:bpfloader_exec:s0
+/system/bin/wait_for_keymaster   u:object_r:wait_for_keymaster_exec:s0
 
 #############################
 # Vendor files