The patch converts mxsfb driver to clk_prepare/clk_unprepare by
using helper functions clk_prepare_enable/clk_disable_unprepare.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: NMarek Vasut <marek.vasut@gmail.com>
Acked-by: NFlorian Tobias Schandinat <FlorianSchandinat@gmx.de>