leds: ktd2692: Add GPIOLIB dependency

The expresswire module requires gpiolib, so anything selecting it
also needs this dependency:

WARNING: unmet direct dependencies detected for LEDS_EXPRESSWIRE
Depends on [n]: NEW_LEDS [=y] && GPIOLIB [=n]
Selected by [y]:
- LEDS_KTD2692 [=y] && NEW_LEDS [=y] && LEDS_CLASS_FLASH [=y] && OF [=y]

Fixes: e59a15af7aa6 ("leds: ktd2692: Convert to use ExpressWire library")
Signed-off-by: Arnd Bergmann <[e-mail]>
Reviewed-by: Daniel Thompson <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Lee Jones <[e-mail]>

drivers/leds/flash/Kconfig

···
 config LEDS_KTD2692
 	tristate "LED support for Kinetic KTD2692 flash LED controller"
 	depends on OF
+	depends on GPIOLIB
 	select LEDS_EXPRESSWIRE
 	help
 	  This option enables support for Kinetic KTD2692 LED flash connected