soc: xilinx: vcu: add helper to wait for PLL locked

Extract a helper function to wait until the PLL is locked. Also,
disabling the bypass was buried in the exit path on the wait loop.
Separate the different steps and add a helper function to make the code
more readable.

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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