b43: N-PHY: implement MIMO config update

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/b43/phy_n.h b/drivers/net/wireless/b43/phy_n.h
index 4572866..ae00e3f 100644
--- a/drivers/net/wireless/b43/phy_n.h
+++ b/drivers/net/wireless/b43/phy_n.h
@@ -973,6 +973,7 @@
 	bool hang_avoid;
 	bool mute;
 	u16 papd_epsilon_offset[2];
+	s32 preamble_override;
 
 	u8 mphase_cal_phase_id;
 	u16 mphase_txcal_cmdidx;