Fix CryptoCdc inconsistent (#7987)

* simple fix

* refactor crypto

* just use codec/legacy.Cdc

* revert armor

* add changelog entry

Co-authored-by: Aleksandr Bezobchuk <alexanderbez@users.noreply.github.com>

crypto/codec/amino.go

@@ -10,13 +10,6 @@ import (
 	cryptotypes "github.com/cosmos/cosmos-sdk/crypto/types"
 )
 
-var amino *codec.LegacyAmino
-
-func init() {
-	amino = codec.NewLegacyAmino()
-	RegisterCrypto(amino)
-}
-
 // RegisterCrypto registers all crypto dependency types with the provided Amino
 // codec.
 func RegisterCrypto(cdc *codec.LegacyAmino) {
@@ -38,15 +31,3 @@ func RegisterCrypto(cdc *codec.LegacyAmino) {
 	cdc.RegisterConcrete(&secp256k1.PrivKey{},
 		secp256k1.PrivKeyName, nil)
 }
-
-// PrivKeyFromBytes unmarshals private key bytes and returns a PrivKey
-func PrivKeyFromBytes(privKeyBytes []byte) (privKey cryptotypes.PrivKey, err error) {
-	err = amino.UnmarshalBinaryBare(privKeyBytes, &privKey)
-	return
-}
-
-// PubKeyFromBytes unmarshals public key bytes and returns a PubKey
-func PubKeyFromBytes(pubKeyBytes []byte) (pubKey cryptotypes.PubKey, err error) {
-	err = amino.UnmarshalBinaryBare(pubKeyBytes, &pubKey)
-	return
-}