resolved,networkd: unify ResolveSupport enum

networkd previously knew an enum "ResolveSupport" for configuring
per-interface LLMNR support, resolved had a similar enum just called
"Support", with the same value and similar pasers.

Unify this, call the enum ResolveSupport, and port both daemons to it.

src/resolve/resolved-link.h

@@ -25,6 +25,7 @@
 
 #include "in-addr-util.h"
 #include "ratelimit.h"
+#include "resolve-util.h"
 
 typedef struct Link Link;
 typedef struct LinkAddress LinkAddress;
@@ -66,8 +67,8 @@ struct Link {
         LIST_HEAD(DnsSearchDomain, search_domains);
         unsigned n_search_domains;
 
-        Support llmnr_support;
-        Support mdns_support;
+        ResolveSupport llmnr_support;
+        ResolveSupport mdns_support;
 
         DnsScope *unicast_scope;
         DnsScope *llmnr_ipv4_scope;