wifi: rtw88: add RTW88_LEDS depends on LEDS_CLASS to Kconfig

When using allmodconfig, .config has CONFIG_LEDS_CLASS=m but
autoconf.h has CONFIG_LEDS_CLASS_MODULE (additional suffix _MODULE)
instead of CONFIG_LEDS_CLASS, which condition CONFIG_LEDS_CLASS in
rtw88/led.h can't work properly.

Add RTW88_LEDS to Kconfig, and use it as condition to fix this problem.

drivers/net/wireless/realtek/rtw88/led.c:19:6: error: redefinition of 'rtw_led_init'
   19 | void rtw_led_init(struct rtw_dev *rtwdev)
      |      ^~~~~~~~~~~~
In file included from drivers/net/wireless/realtek/rtw88/led.c:7:
drivers/net/wireless/realtek/rtw88/led.h:15:20: note: previous definition of 'rtw_led_init' with type 'void(struct rtw_dev *)'
   15 | static inline void rtw_led_init(struct rtw_dev *rtwdev)
      |                    ^~~~~~~~~~~~
drivers/net/wireless/realtek/rtw88/led.c:64:6: error: redefinition of 'rtw_led_deinit'
   64 | void rtw_led_deinit(struct rtw_dev *rtwdev)
      |      ^~~~~~~~~~~~~~
drivers/net/wireless/realtek/rtw88/led.h:19:20: note: previous definition of 'rtw_led_deinit' with type 'void(struct rtw_dev *)'
   19 | static inline void rtw_led_deinit(struct rtw_dev *rtwdev)
      |                    ^~~~~~~~~~~~~~

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Closes: https://lore.kernel.org/linux-wireless/e19a87ad9cd54bfa9907f3a043b25d30@realtek.com/T/#me407832de1040ce22e53517bcb18e322ad0e2260
Fixes: 4b6652b ("wifi: rtw88: Add support for LED blinking")
Cc: Bitterblue Smith <rtl8821cerfe2@gmail.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://patch.msgid.link/20250116120424.13174-1-pkshih@realtek.com

drivers/net/wireless/realtek/rtw88/Kconfig

@@ -238,4 +238,9 @@ config RTW88_DEBUGFS
 
 	  If unsure, say Y to simplify debug problems
 
+config RTW88_LEDS
+	bool
+	depends on LEDS_CLASS=y || LEDS_CLASS=MAC80211
+	default y
+
 endif

drivers/net/wireless/realtek/rtw88/Makefile

@@ -20,7 +20,7 @@ rtw88_core-y += main.o \
 
 rtw88_core-$(CONFIG_PM) += wow.o
 
-rtw88_core-$(CONFIG_LEDS_CLASS) += led.o
+rtw88_core-$(CONFIG_RTW88_LEDS) += led.o
 
 obj-$(CONFIG_RTW88_8822B)	+= rtw88_8822b.o
 rtw88_8822b-objs		:= rtw8822b.o rtw8822b_table.o

drivers/net/wireless/realtek/rtw88/led.h

@@ -5,7 +5,7 @@
 #ifndef __RTW_LED_H
 #define __RTW_LED_H
 
-#ifdef CONFIG_LEDS_CLASS
+#ifdef CONFIG_RTW88_LEDS
 
 void rtw_led_init(struct rtw_dev *rtwdev);
 void rtw_led_deinit(struct rtw_dev *rtwdev);