kvdb: move channeldb/kvdb to top level

channeldb/migration12/migration.go

@@ -3,8 +3,8 @@ package migration12
 import (
 	"bytes"
 
-	"github.com/lightningnetwork/lnd/channeldb/kvdb"
 	lnwire "github.com/lightningnetwork/lnd/channeldb/migration/lnwire21"
+	"github.com/lightningnetwork/lnd/kvdb"
 )
 
 var emptyFeatures = lnwire.NewFeatureVector(nil, nil)

channeldb/migration12/migration_test.go

@@ -5,9 +5,9 @@ import (
 	"fmt"
 	"testing"
 
-	"github.com/lightningnetwork/lnd/channeldb/kvdb"
 	"github.com/lightningnetwork/lnd/channeldb/migration12"
 	"github.com/lightningnetwork/lnd/channeldb/migtest"
+	"github.com/lightningnetwork/lnd/kvdb"
 	"github.com/lightningnetwork/lnd/lntypes"
 )