ARM: dts: exynos: Replace "clock-freq-min-max" with "max-frequency"

In drivers/mmc/core/host.c, there is a "max-frequency" property.
Behavior should not change, so use the "max-frequency" instead of
"clock-freq-min-max".

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>