WHENCE: Add missing entry for mlxsw_spectrum firmware

Fixes: a4c72696f5 ("Mellanox: Add firmware for mlxsw_spectrum")
Signed-off-by: Shalom Toledo <shalomt@mellanox.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

WHENCE

@@ -3756,3 +3756,40 @@ Licence: Redistributable. See LICENSE.qcom and qcom/NOTICE.txt for details
 
 Binary files supplied originally from
 https://developer.qualcomm.com/hardware/dragonboard-410c/tools
+
+--------------------------------------------------------------------------
+
+Driver: mlxsw_spectrum - Mellanox Spectrum switch
+
+File: mellanox/mlxsw_spectrum-13.1420.122.mfa2
+
+Licence:
+ Copyright (c) 2017 Mellanox Technologies, Ltd. All rights reserved.
+
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+ modification, are permitted provided that the following conditions are met:
+
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+    contributors may be used to endorse or promote products derived from
+    this software without specific prior written permission.
+
+ Alternatively, this software may be distributed under the terms of the
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+ Software Foundation.
+
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