iwlwifi: rs: align to new TLC config command API

The new API adds 4 bytes at end of the struct.  We just need to make
sure that we don't break compatibility with old FWs.

Signed-off-by: Mordechay Goodstein <mordechay.goodstein@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/iwlwifi.20201008181047.bb31ce80fc55.I8a272d1da1334b1805761c0731e5d0c76ca2ef29@changeid