clocksource/drivers/exynos_mct: Staticize struct clocksource
clocksource/drivers/exynos_mct: Staticize struct clocksource

The struct clocksource 'mct_frc' is not exported and used outside so
make it static.

Signed-off-by: Krzysztof Kozlowski <1a8531307367602b8284517edb33d53d54e5ce8e@samsung.com>
Signed-off-by: Daniel Lezcano <e9fa45941f2ebe89c1b9d6c5f339ab42eadb8567@linaro.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs