b43legacy: include full 64-bit timestamp in monitor mode

When monitor mode is enabled, this will make b43legacy read out
the full 64-bit MAC time from the chip for each received packet.

This patch has been ported from b43.

Signed-off-by: Stefano Brivio <stefano.brivio@polimi.it>
Cc: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/b43legacy/main.c b/drivers/net/wireless/b43legacy/main.c
index 1a8b676..92c03b0 100644
--- a/drivers/net/wireless/b43legacy/main.c
+++ b/drivers/net/wireless/b43legacy/main.c
@@ -2553,6 +2553,8 @@
 			b43legacy_short_slot_timing_disable(dev);
 	}
 
+	dev->wl->radiotap_enabled = !!(conf->flags & IEEE80211_CONF_RADIOTAP);
+
 	/* Adjust the desired TX power level. */
 	if (conf->power_level != 0) {
 		if (conf->power_level != phy->power_level) {