Move metadata concurrency to a separate file

Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>

src/concurrency/ocf_metadata_concurrency.c

@@ -0,0 +1,18 @@
+/*
+ * Copyright(c) 2019-2019 Intel Corporation
+ * SPDX-License-Identifier: BSD-3-Clause-Clear
+ */
+
+#include "ocf_metadata_concurrency.h"
+
+void ocf_metadata_concurrency_init(struct ocf_cache *cache)
+{
+	env_spinlock_init(&cache->metadata.lock.eviction);
+	env_rwlock_init(&cache->metadata.lock.status);
+	env_rwsem_init(&cache->metadata.lock.collision);
+}
+
+int ocf_metadata_concurrency_attached_init(struct ocf_cache *cache)
+{
+	return 0;
+}