ARM: EXYNOS: Pass wakeup mask parameter to function for cpuidle

Pass the wakeup mask to 'exynos_set_wakeupmask' as this function could
be used for different idle states with different mask.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>