at91: fix at91-adc dependencies

Error reported by buildbot:
Package kmod-at91-adc is missing dependencies for the following libraries:
input-core.ko

only compile tested

Signed-off-by: Dirk Neukirchen <dirkneukirchen@web.de>

SVN-Revision: 42893

target/linux/at91/modules.mk

@@ -38,7 +38,7 @@ $(eval $(call KernelPackage,pwm-atmel))
 define KernelPackage/at91-adc
   SUBMENU:=$(OTHER_MENU)
   TITLE:=ADC on atmel SoC
-  DEPENDS:=@TARGET_at91 +kmod-iio-core
+  DEPENDS:=@TARGET_at91 +kmod-iio-core +kmod-input-core
   KCONFIG:=CONFIG_AT91_ADC
   FILES:=$(LINUX_DIR)/drivers/iio/adc/at91_adc.ko
   AUTOLOAD:=$(call AutoLoad,40,at91_adc)