mfd: Fix ucb1x00 build failure for collie_defconfig
This patch fixes a build failure[1], by adding the missing semaphore.h include References: [1] http://kisskb.ellerman.id.au/kisskb/buildresult/2234322/ Signed-off-by: Peter Huewe <peterhuewe@gmx.de> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
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