iwlwifi: remove useless extern definition of iwl4265_2ac_sdio_cfg

This device was renamed, but the external definition remained there.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

drivers/net/wireless/iwlwifi/iwl-config.h

@@ -379,7 +379,6 @@ extern const struct iwl_cfg iwl7265d_n_cfg;
 extern const struct iwl_cfg iwl8260_2n_cfg;
 extern const struct iwl_cfg iwl8260_2ac_cfg;
 extern const struct iwl_cfg iwl8260_2ac_sdio_cfg;
-extern const struct iwl_cfg iwl4265_2ac_sdio_cfg;
 extern const struct iwl_cfg iwl4165_2ac_sdio_cfg;
 #endif /* CONFIG_IWLMVM */