Use clk_prepare_enable/clk_disable_unprepare to make the driver
work properly with common clock framework.
Signed-off-by: NVasily Khoruzhick <anarsoul@gmail.com>
Reviewed-by: NTomasz Figa <t.figa@samsung.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>