mmc: sdhci: disable the clock in sdhci_pltfm_unregister()

So we can avoid to sprinkle the clk_disable_unprepare() in many
drivers.

Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
7 files changed