wifi: rtl8xxxu: add LEDS_CLASS dependency

rtl8xxxu now unconditionally uses LEDS_CLASS, so a Kconfig dependency
is required to avoid link errors:

aarch64-linux-ld: drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.o: in function `rtl8xxxu_disconnect':
rtl8xxxu_core.c:(.text+0x730): undefined reference to `led_classdev_unregister'

ERROR: modpost: "led_classdev_unregister" [drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.ko] undefined!
ERROR: modpost: "led_classdev_register_ext" [drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.ko] undefined!

Fixes: 3be01622 ("wifi: rtl8xxxu: Register the LED and make it blink")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230217095910.2480356-1-arnd@kernel.org

drivers/net/wireless/realtek/rtl8xxxu/Kconfig

@@ -5,6 +5,7 @@
 config RTL8XXXU
 	tristate "Realtek 802.11n USB wireless chips support"
 	depends on MAC80211 && USB
+	depends on LEDS_CLASS
 	help
 	  This is an alternative driver for various Realtek RTL8XXX
 	  parts written to utilize the Linux mac80211 stack.