imx6: clock: improve calculations to get the PLL video rate

During some tests to check the pixel clock rate in the transition from
U-Boot to the Linux kernel, I noticed that with the same configuration
of the registers the debug messages reported different rates.

The same Linux kernel calculations are now used to get the PLL video
rate.

Signed-off-by: Dario Binacchi <[email protected]>
Reviewed-by: Michael Trimarchi <[email protected]>

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