Support or remove SignedTypedMessage on celo's ledger app

[mcortesi]

Description

Add support or remove

On ledger.go

/* TODO: add functionality to the Ledger's Celo app
// SignTypedMessage implements usbwallet.driver, sending the message to the Ledger and
// waiting for the user to sign or deny the transaction.
//
// Note: this was introduced in the ledger 1.5.0 firmware
func (w *ledgerDriver) SignTypedMessage(path accounts.DerivationPath, domainHash []byte, messageHash []byte) ([]byte, error) {
	// If the Ethereum app doesn't run, abort
	if w.offline() {
		return nil, accounts.ErrWalletClosed
	}
	// Ensure the wallet is capable of signing the given transaction
	if w.version[0] < 1 && w.version[1] < 5 {
		//lint:ignore ST1005 brand name displayed on the console
		return nil, fmt.Errorf("Ledger version >= 1.5.0 required for EIP-712 signing (found version v%d.%d.%d)", w.version[0], w.version[1], w.version[2])
	}
	// All infos gathered and metadata checks out, request signing
	return w.ledgerSignTypedMessage(path, domainHash, messageHash)
}
*/

Context

Leftover 1.10.7 merge

[palango]

@mcortesi Any idea if this is something we still need to look into?