wifi: iwlwifi: mld: remove support from of sta cmd version 1

The last FW API that supports version 1 is 99. Since this API is no
longer supported on any device that loads iwlmld, we can remove support
of it.

Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20250909061931.4d6689d5c4b2.I5d2bf7302eea8ac7a805f58e4e60e527d6f5b346@changeid