clk: imx: imx8qxp: Add clock muxes for MIPI and PHY ref clocks

The MIPI Pixel and PHY Reference can use the bypass clock as a source. The
MIPI bypass clock is the Pixel clock from the Display controller via the
pixel link. Using the pixel clock for the PHY reference allows the MIPI bit
clock match the pixel rate exactly.

The MIPI pixel clock is currently set to be source from the bypass clock in
the SCFW. This patch allows the pixel clock parent to be set by the kernel
in the event that the SCFW default clock parent may change in the future.

Signed-off-by: Oliver F. Brown <[email protected]>
Signed-off-by: Robert Chiras <[email protected]>
Signed-off-by: Peng Fan <[email protected]>
Reviewed-by: Abel Vesa <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Abel Vesa <[email protected]>

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