Rename util/logging.h to avoid collisions

Currently, the util/logging.h file causes build issues because other
external repos have the same file.

This patch fixes this bug by renaming our copy of logging.h to
osp_logging.h, the same way we renamed DCHECK to OSP_DCHECK.

Bug: b/155927492
Change-Id: I75ff546775bed01daeda2a631c06b4776e3829f1
Reviewed-on: https://chromium-review.googlesource.com/c/openscreen/+/2186351
Reviewed-by: mark a. foltz <mfoltz@chromium.org>
diff --git a/platform/impl/task_runner.cc b/platform/impl/task_runner.cc
index ac4a49a..d8f941c 100644
--- a/platform/impl/task_runner.cc
+++ b/platform/impl/task_runner.cc
@@ -7,7 +7,7 @@
 #include <csignal>
 #include <thread>
 
-#include "util/logging.h"
+#include "util/osp_logging.h"
 
 namespace openscreen {