libertas: update readme file

Since all wext specific code is removed, currently there is no
way to configure deep sleep mode. This patch removes deep sleep
configuration information in readme file.
Signed-off-by: NAmitkumar Karwar <akarwar@marvell.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/libertas/README

@@ -238,28 +238,3 @@ hostsleep
 		echo "1" > hostsleep : enable host sleep.
 		echo "0" > hostsleep : disable host sleep
 
-========================
-IWCONFIG COMMANDS
-========================
-power period
-
-	This command is used to configure the station in deep sleep mode /
-	auto deep sleep mode.
-
-	The timer is implemented to monitor the activities (command, event,
-	etc.). When an activity is detected station will exit from deep
-	sleep mode automatically and restart the timer. At timer expiry
-	(no activity for defined time period) the deep sleep mode is entered
-	automatically.
-
-	Note: this command is for SDIO interface only.
-
-	Usage:
-	To enable deep sleep mode do:
-		iwconfig wlan0 power period 0
-	To enable auto deep sleep mode with idle time period 5 seconds do:
-		iwconfig wlan0 power period 5
-	To disable deep sleep/auto deep sleep mode do:
-		iwconfig wlan0 power period -1
-
-==============================================================================