wifi: iwlwifi: mld: remove support of iwl_esr_mode_notif version 1

The last FW API that supports version 5 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.e15a7fa15c70.Ibb8636e826136c8c31931e77f5ffa853372b4301@changeid