imx: clock: gate clk before changing pix clk mux
The LCDIF Pixel clock mux is not glitchless, so need
to gate before changing mux.
Also change enable_lcdif_clock prototype with a new input
parameter to indicate disable or enable.
Signed-off-by: NPeng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
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