Mellanox: Add new mlxsw_spectrum firmware 13.1910.622

This new firmware contains:
 * New packet traps for discarded packets
 * Secure firmware flash bug fix
 * Fence mechanism bug fix
 * TCAM RMA bug fix

Signed-off-by: Shalom Toledo <shalomt@mellanox.com>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>

WHENCE

@@ -4194,6 +4194,7 @@ File: mellanox/mlxsw_spectrum-13.1530.152.mfa2
 File: mellanox/mlxsw_spectrum-13.1620.192.mfa2
 File: mellanox/mlxsw_spectrum-13.1702.6.mfa2
 File: mellanox/mlxsw_spectrum-13.1703.4.mfa2
+File: mellanox/mlxsw_spectrum-13.1910.622.mfa2
 
 Licence:
  Copyright (c) 2017-2018 Mellanox Technologies, Ltd. All rights reserved.