Use #pragma one for all liblog includes

Test: build
Change-Id: I0ffe40853a89acffc1af4fd3838ef488706d23dc
diff --git a/liblog/logd_reader.h b/liblog/logd_reader.h
index 8ebb1ae..0bba7cf 100644
--- a/liblog/logd_reader.h
+++ b/liblog/logd_reader.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBLOG_LOGD_READER_H__
-#define _LIBLOG_LOGD_READER_H__
+#pragma once
 
 #include <unistd.h>
 
@@ -26,5 +25,3 @@
 LIBLOG_HIDDEN ssize_t __send_log_msg(char* buf, size_t buf_size);
 
 __END_DECLS
-
-#endif /* _LIBLOG_LOGD_READER_H__ */