p54: honour bss_info_changed's short slot time settings

This patch was made on behalf of Johannes request.
"mac80211 and IEEE80211_CONF_SHORT_SLOT_TIME"

Of course, bss_info_changed provides some more useful data.
e.g.: basic_rates, dtim_period, beacon_int and maybe even more.
Everything can be hooked up if it's necessary.

Signed-off-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/p54/p54.h b/drivers/net/wireless/p54/p54.h
index 1d0704f..8da4d30 100644
--- a/drivers/net/wireless/p54/p54.h
+++ b/drivers/net/wireless/p54/p54.h
@@ -81,6 +81,7 @@
 	unsigned int output_limit_len;
 	struct pda_pa_curve_data *curve_data;
 	unsigned int filter_flags;
+	bool use_short_slot;
 	u16 rxhw;
 	u8 version;
 	u8 rx_antenna;