Allow system_server access to system logs

This is enabled for debugging purposes only. Since
kernel buffer for logs is small, this will allow
external services to capture a bit of data so it
can be reported later.

Change-Id: I588eb91159e6aad07ead9afab9759764b8b3520d

system_server.te

@@ -432,6 +432,9 @@ userdebug_or_eng(`
   # Allow system server to create and write method traces in /data/misc/trace.
   allow system_server method_trace_data_file:dir w_dir_perms;
   allow system_server method_trace_data_file:file { create w_file_perms };
+
+  # Allow system server to read dmesg
+  allow system_server kernel:system syslog_read;
 ')
 
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