iwlwifi: remove unused no_sleep_autoadjust declaration

no_sleep_autoadjust has been removed since
commit 8496579 ("iwlwifi: remove no_sleep_autoadjust"),
so remove it.

Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Link: https://patch.msgid.link/20220911090241.3207201-3-cuigaosheng1@huawei.com
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>

Author: gscui

drivers/net/wireless/intel/iwlwifi/dvm/power.h

@@ -23,6 +23,4 @@ int iwl_power_set_mode(struct iwl_priv *priv, struct iwl_powertable_cmd *cmd,
 int iwl_power_update_mode(struct iwl_priv *priv, bool force);
 void iwl_power_initialize(struct iwl_priv *priv);
 
-extern bool no_sleep_autoadjust;
-
 #endif  /* __iwl_power_setting_h__ */