record+tlv/onion_types: move type constants to route/hop

tlv/onion_types.go

@@ -1,15 +0,0 @@
-package tlv
-
-const (
-	// AmtOnionType is the type used in the onion to refrence the amount to
-	// send to the next hop.
-	AmtOnionType Type = 2
-
-	// LockTimeTLV is the type used in the onion to refenernce the CLTV
-	// value that should be used for the next hop's HTLC.
-	LockTimeOnionType Type = 4
-
-	// NextHopOnionType is the type used in the onion to reference the ID
-	// of the next hop.
-	NextHopOnionType Type = 6
-)