mwifiex: remove MWIFIEX_BSS_MODE_ macros

replace them with NL80211_IFTYPE_ macros

Also remove redundant functions mwifiex_drv_get_mode()
and mwifiex_bss_ioctl_mode().

Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/mwifiex/cfp.c b/drivers/net/wireless/mwifiex/cfp.c
index 999ed81..07187a4 100644
--- a/drivers/net/wireless/mwifiex/cfp.c
+++ b/drivers/net/wireless/mwifiex/cfp.c
@@ -288,8 +288,7 @@
 {
 	u32 k = 0;
 	struct mwifiex_adapter *adapter = priv->adapter;
-	if (priv->bss_mode == MWIFIEX_BSS_MODE_INFRA) {
-		/* Infra. mode */
+	if (priv->bss_mode == NL80211_IFTYPE_STATION) {
 		switch (adapter->config_bands) {
 		case BAND_B:
 			dev_dbg(adapter->dev, "info: infra band=%d "