Fixes this compilation error:
  linux/include/linux/mfd/ucb1x00.h:137:17: error: field 'dev' has incomplete type
Signed-off-by: NAndrea Adami <andrea.adami@gmail.com>
Signed-off-by: NLee Jones <lee.jones@linaro.org>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>