spi: rzv2m-csi: Get rid of the x_trg{_words} tables

Table x_trg can be replaced with ilog2(), and table x_trg_words
can be replaced with rounddown_pow_of_two().
Replace the tables usage with the corresponding macros.
While at it, remove a couple of unnecessary empty lines.

Signed-off-by: Fabrizio Castro <[email protected]>
Suggested-by: Andy Shevchenko <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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