ARM mxs: clkdev related compile fixes

Since commit

	6d803ba (ARM: 6483/1: arm & sh: factorised duplicated clkdev.c)

platforms need to select CLKDEV_LOOKUP instead of COMMON_CLKDEV and need
to include <linux/clkdev.h>.

Cc: Shawn Guo <shawn.guo@freescale.com>
Cc: Lothar Waßmann <LW@KARO-electronics.de>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>