clk: mvebu: add missing iounmap

Add missing iounmap to setup error path.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

diff --cc drivers/clk/mvebu/clk-cpu.c
Simple merge

diff --cc drivers/clk/mvebu/common.c
Simple merge