[MOS] user feature key path init

Refine the user feature key path initializaiton and deinitialization.
diff --git a/media_driver/agnostic/common/os/mos_utilities_common.h b/media_driver/agnostic/common/os/mos_utilities_common.h
index e9c9fd7..7bc555a 100644
--- a/media_driver/agnostic/common/os/mos_utilities_common.h
+++ b/media_driver/agnostic/common/os/mos_utilities_common.h
@@ -820,7 +820,6 @@
 {
     char *   Path;
     uint32_t Length;
-    uint32_t RefCnt;
 } MOS_USER_FEATURE_KEY_PATH_INFO, *PMOS_USER_FEATURE_KEY_PATH_INFO;
 
 #ifdef __cplusplus