Add module_load permission to system class

Enforce restrictions on kernel module origin when kernel has commit:
61d612ea selinux: restrict kernel module loading

Bug: 27824855
Change-Id: Icf2fefec4231f3df8f0f3d914123c22084d87b0b
diff --git a/access_vectors b/access_vectors
index c38aa7b..26286b2 100644
--- a/access_vectors
+++ b/access_vectors
@@ -352,6 +352,7 @@
 	syslog_mod
 	syslog_console
 	module_request
+	module_load
 }
 
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