soc: xilinx: vcu: make pll post divider explicit

According to the downstream driver documentation due to timing
constraints the output divider of the PLL has to be set to 1/2. Add a
helper function for that check instead of burying the code in one large
setup function.

The bit is undocumented and marked as reserved in the register
reference.

Signed-off-by: Michael Tretter <[email protected]>
Acked-by: Michal Simek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Stephen Boyd <[email protected]>

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