Add audit_read permission to capability2

In kernel 3.18 following error message is seen
since audit_read is added to capability2 at classmap.h
So add audit_read permission to capability2.

SELinux:  Permission audit_read in class capability2 not defined in policy.
SELinux: the above unknown classes and permissions will be denied

The kernel change from AOSP is:
https://android.googlesource.com/kernel/common/+/3a101b8de0d39403b2c7e5c23fd0b005668acf48%5E%21/security/selinux/include/classmap.h



Change-Id: I236fbb8ac575c5cb8df097014da6395e20378175
Signed-off-by: Woojung Min <wmin@nvidia.com>

access_vectors

@@ -406,6 +406,7 @@ class capability2
 	syslog
 	wake_alarm
 	block_suspend
+	audit_read
 }
 
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