soc: mediatek: pwrap: Use readx_poll_timeout() instead of custom function

Function pwrap_wait_for_state() is a function that polls an address
through a helper function, but this is the very same operation that
the readx_poll_timeout macro means to do.
Convert all instances of calling pwrap_wait_for_state() to instead
use the read_poll_timeout macro.

Signed-off-by: AngeloGioacchino Del Regno <[email protected]>
Reviewed-by: Nícolas F. R. A. Prado <[email protected]>
Tested-by: Nícolas F. R. A. Prado <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Matthias Brugger <[email protected]>

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