staging: wfx: improve API of hif_req_join->infrastructure_bss_mode

In fact "mode" is a boolean that indicates if IBSS mode is used. This
patch fixes the name and uses a more adapted memory representation.
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20191217161318.31402-27-Jerome.Pouiller@silabs.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wfx/hif_api_cmd.h

@@ -377,11 +377,6 @@ struct hif_cnf_edca_queue_params {
 	u32   status;
 } __packed;
 
-enum hif_ap_mode {
-	HIF_MODE_IBSS                              = 0x0,
-	HIF_MODE_BSS                               = 0x1
-};
-
 enum hif_preamble {
 	HIF_PREAMBLE_LONG                          = 0x0,
 	HIF_PREAMBLE_SHORT                         = 0x1,
@@ -396,7 +391,8 @@ struct hif_join_flags {
 } __packed;
 
 struct hif_req_join {
-	u8    mode;
+	u8    infrastructure_bss_mode:1;
+	u8    reserved1:7;
 	u8    band;
 	u16   channel_number;
 	u8    bssid[ETH_ALEN];

drivers/staging/wfx/sta.c

@@ -651,7 +651,7 @@ static void wfx_do_join(struct wfx_vif *wvif)
 	struct ieee80211_bss_conf *conf = &wvif->vif->bss_conf;
 	struct cfg80211_bss *bss = NULL;
 	struct hif_req_join join = {
-		.mode = conf->ibss_joined ? HIF_MODE_IBSS : HIF_MODE_BSS,
+		.infrastructure_bss_mode = !conf->ibss_joined,
 		.preamble_type = conf->use_short_preamble ? HIF_PREAMBLE_SHORT : HIF_PREAMBLE_LONG,
 		.probe_for_join = 1,
 		.atim_window = 0,