libertas: Improvements on automatic tx power control via SIOCSIWTXPOW.

iwconfig txpower can now be used to set tx power to fixed or auto. If set to
auto the default firmware settings are used.

The command CMD_802_11_PA_CFG is only sent to older firmware, as Dan Williams
noted the command was no longer supported in firmware V9+.

Signed-off-by: Anna Neal <anna@cozybit.com>
Signed-off-by: Javier Cardona <javier@cozybit.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/libertas/host.h b/drivers/net/wireless/libertas/host.h
index da618fc..a916bb9 100644
--- a/drivers/net/wireless/libertas/host.h
+++ b/drivers/net/wireless/libertas/host.h
@@ -83,6 +83,7 @@
 #define CMD_802_11_INACTIVITY_TIMEOUT		0x0067
 #define CMD_802_11_SLEEP_PERIOD			0x0068
 #define CMD_802_11_TPC_CFG			0x0072
+#define CMD_802_11_PA_CFG			0x0073
 #define CMD_802_11_FW_WAKE_METHOD		0x0074
 #define CMD_802_11_SUBSCRIBE_EVENT		0x0075
 #define CMD_802_11_RATE_ADAPT_RATESET		0x0076