mfd: ucb1400 needs GPIO

ia64 allmodconfig:

In file included from include/linux/ucb1400.h:27,
                 from drivers/mfd/ucb1400_core.c:24:
include/asm-generic/gpio.h: In function `gpio_get_value_cansleep':
include/asm-generic/gpio.h:147: error: implicit declaration of function `gpio_get_value'
include/asm-generic/gpio.h: In function `gpio_set_value_cansleep':
include/asm-generic/gpio.h:153: error: implicit declaration of function `gpio_set_value'
drivers/mfd/ucb1400_core.c: At top level:
Signed-off-by: NSamuel Ortiz <sameo@openedhand.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>

drivers/mfd/Kconfig

@@ -53,6 +53,7 @@ config HTC_PASIC3
 config UCB1400_CORE
 	tristate "Philips UCB1400 Core driver"
 	depends on AC97_BUS
+	depends on GPIOLIB
 	help
 	  This enables support for the Philips UCB1400 core functions.
 	  The UCB1400 is an AC97 audio codec.