wifi: iwlwifi: mei: Remove unused flexible-array member in struct iwl_sap_hdr

Remove unused fexible-array member and avoid 14 of the following type of
warnings:

drivers/net/wireless/intel/iwlwifi/mei/sap.h:318:28: warning: structure containing a flexible array member is not at the end of another structure
[-Wflex-array-member-not-at-end]

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://patch.msgid.link/aK6-usANI1UPtFVo@kspp
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>

Author: GustavoARSilva

drivers/net/wireless/intel/iwlwifi/mei/sap.h

@@ -300,13 +300,11 @@ enum iwl_sap_msg {
  * @type: See &enum iwl_sap_msg.
  * @len: The length of the message (header not included).
  * @seq_num: For debug.
- * @payload: The payload of the message.
  */
 struct iwl_sap_hdr {
 	__le16 type;
 	__le16 len;
 	__le32 seq_num;
-	u8 payload[];
 };
 
 /**