p54: fix SoftLED compile dependencies

This patch fixes a compile problem when the MAC80211_LEDS
triggers are enabled but not LED class itself.
(which is sort of pointless, but anyway...)

Signed-off-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/p54/Kconfig b/drivers/net/wireless/p54/Kconfig
index 0e344ac..7d6e9d1 100644
--- a/drivers/net/wireless/p54/Kconfig
+++ b/drivers/net/wireless/p54/Kconfig
@@ -71,3 +71,8 @@
 	  Nokia's N800/N810 Portable Internet Tablet.
 
 	  If you choose to build a module, it'll be called p54spi.
+
+config P54_LEDS
+	bool
+	depends on P54_COMMON && MAC80211_LEDS && (LEDS_CLASS = y || LEDS_CLASS = P54_COMMON)
+	default y