mmc: exynos_dw_mmc: Read common clock-frequency property

Instead of using non-standard "bus_hz" dts property, read common
"clock-frequency" property used in upstream Linux kernel. It's safe to
do so, as "clock-frequency" property was already added to corresponding
nodes in all affected Exynos device tree files.

No functional change.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
1 file changed