staging: wfx: fix highest Rx value declared in ieee80211_supported_band

The highest Rx value declared in ieee80211_supported_band had two
problems:
    1. The value should be little endian
    2. ShortGI was not taken into account. So value should be 72 instead
       of 65.
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200427134031.323403-9-Jerome.Pouiller@silabs.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wfx/main.c

@@ -106,7 +106,7 @@ static const struct ieee80211_supported_band wfx_band_2ghz = {
 		.ampdu_density = IEEE80211_HT_MPDU_DENSITY_NONE,
 		.mcs = {
 			.rx_mask = { 0xFF }, // MCS0 to MCS7
-			.rx_highest = 65,
+			.rx_highest = cpu_to_le16(72),
 			.tx_params = IEEE80211_HT_MCS_TX_DEFINED,
 		},
 	},