iwlwifi: combine 9260 cfgs that only change names

All the 0x2526 devices are now in the new table, so we can start
reusing configurations and adding the strings independently to all of
them, reusing them when possible.

Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20200309091348.88e3d47c42a8.I1bd37ae0d0f9f79732f03badf84d7d063993b73e@changeid