[asmap] Remove SanityCheckASMap() from netaddress

SanityCheckASMap(asmap, bits) simply calls through to SanityCheckASMap(asmap)
in util/asmap. Update all callers to simply call that function.

src/netaddress.cpp

@@ -1242,8 +1242,3 @@ bool operator<(const CSubNet& a, const CSubNet& b)
 {
     return (a.network < b.network || (a.network == b.network && memcmp(a.netmask, b.netmask, 16) < 0));
 }
-
-bool SanityCheckASMap(const std::vector<bool>& asmap)
-{
-    return SanityCheckASMap(asmap, 128); // For IP address lookups, the input is 128 bits
-}