Use #pragma one for all liblog includes

Test: build
Change-Id: I0ffe40853a89acffc1af4fd3838ef488706d23dc
diff --git a/liblog/config_write.h b/liblog/config_write.h
index db1a083..e3be445 100644
--- a/liblog/config_write.h
+++ b/liblog/config_write.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _LIBLOG_CONFIG_WRITE_H__
-#define _LIBLOG_CONFIG_WRITE_H__
+#pragma once
 
 #include <cutils/list.h>
 
@@ -51,5 +50,3 @@
 LIBLOG_HIDDEN void __android_log_config_write_close();
 
 __END_DECLS
-
-#endif /* _LIBLOG_CONFIG_WRITE_H__ */