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/index/coinstatsindex.cpp

@@ -17,7 +17,6 @@
 #include <interfaces/chain.h>
 #include <interfaces/types.h>
 #include <kernel/coinstats.h>
-#include <logging.h>
 #include <primitives/block.h>
 #include <primitives/transaction.h>
 #include <script/script.h>
@@ -26,6 +25,7 @@
 #include <undo.h>
 #include <util/check.h>
 #include <util/fs.h>
+#include <util/log.h>
 #include <validation.h>
 
 #include <compare>