mmc: rtsx: fix possible linking error if built-in

rtsx_usb_sdmmc module uses the LED classdev if available, but the code
failed to consider the situation that it is built-in and the LED classdev is a
module, leading to following linking error:

   LD      init/built-in.o
drivers/built-in.o: In function `rtsx_usb_sdmmc_drv_remove':
rtsx_usb_sdmmc.c:(.text+0x2a018e): undefined reference to
`led_classdev_unregister'
drivers/built-in.o: In function `rtsx_usb_sdmmc_drv_probe':
rtsx_usb_sdmmc.c:(.text+0x2a197e): undefined reference to
`led_classdev_register'

Fix by excluding such condition when defining macro RTSX_USB_USE_LEDS_CLASS.
Signed-off-by: Roger Tseng <rogerable@realtek.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>

drivers/mmc/host/rtsx_usb_sdmmc.c

@@ -34,7 +34,8 @@
 #include <linux/mfd/rtsx_usb.h>
 #include <asm/unaligned.h>
 
-#if defined(CONFIG_LEDS_CLASS) || defined(CONFIG_LEDS_CLASS_MODULE)
+#if defined(CONFIG_LEDS_CLASS) || (defined(CONFIG_LEDS_CLASS_MODULE) && \
+		defined(CONFIG_MMC_REALTEK_USB_MODULE))
 #include <linux/leds.h>
 #include <linux/workqueue.h>
 #define RTSX_USB_USE_LEDS_CLASS
@@ -59,7 +60,7 @@ struct rtsx_usb_sdmmc {
 
 	unsigned char		power_mode;
 
-#if defined(CONFIG_LEDS_CLASS) || defined(CONFIG_LEDS_CLASS_MODULE)
+#ifdef RTSX_USB_USE_LEDS_CLASS
 	struct led_classdev	led;
 	char			led_name[32];
 	struct work_struct	led_work;