refactor(core): move amino registrar and drop legacy package (backport #21531) (#21561)

Co-authored-by: Julien Robert <julien@rbrt.fr>

x/staking/module.go

@@ -10,7 +10,6 @@ import (
 	"google.golang.org/grpc"
 
 	"cosmossdk.io/core/appmodule"
-	"cosmossdk.io/core/legacy"
 	"cosmossdk.io/core/registry"
 	"cosmossdk.io/depinject"
 	"cosmossdk.io/x/staking/client/cli"
@@ -75,8 +74,8 @@ func (AppModule) Name() string {
 }
 
 // RegisterLegacyAminoCodec registers the staking module's types on the given LegacyAmino codec.
-func (AppModule) RegisterLegacyAminoCodec(cdc legacy.Amino) {
-	types.RegisterLegacyAminoCodec(cdc)
+func (AppModule) RegisterLegacyAminoCodec(registrar registry.AminoRegistrar) {
+	types.RegisterLegacyAminoCodec(registrar)
 }
 
 // RegisterInterfaces registers the module's interface types