logging: use util/log.h where possible

Preparation for a future commit where kernel's dependency
on logging.cpp is removed completely.

Replace usage of logging\.h with util/log\.h where it
suffices, and fix wrong includes according to iwyu.

src/kernel/coinstats.cpp

@@ -8,7 +8,6 @@
 #include <coins.h>
 #include <crypto/muhash.h>
 #include <hash.h>
-#include <logging.h>
 #include <node/blockstorage.h>
 #include <primitives/transaction.h>
 #include <script/script.h>
@@ -17,6 +16,7 @@
 #include <sync.h>
 #include <uint256.h>
 #include <util/check.h>
+#include <util/log.h>
 #include <util/overflow.h>
 #include <validation.h>