wireless: consolidate on a single escape_essid implementation

Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/Kconfig b/drivers/net/wireless/Kconfig
index 45bdf0b..42afaed 100644
--- a/drivers/net/wireless/Kconfig
+++ b/drivers/net/wireless/Kconfig
@@ -271,6 +271,7 @@
 	tristate "Marvell 8xxx Libertas WLAN driver support"
 	depends on WLAN_80211
 	select WIRELESS_EXT
+	select LIB80211
 	select FW_LOADER
 	---help---
 	  A library for Marvell Libertas 8xxx devices.