Demote, cleanup and extend observed logging
diff --git a/osi/src/semaphore.c b/osi/src/semaphore.c
index 4c45b2e..b8dddcf 100644
--- a/osi/src/semaphore.c
+++ b/osi/src/semaphore.c
@@ -16,7 +16,7 @@
  *
  ******************************************************************************/
 
-#define LOG_TAG "osi_semaphore"
+#define LOG_TAG "bt_osi_semaphore"
 
 #include <assert.h>
 #include <errno.h>