ASoC: wm8940: Correct PLL rate rounding

Using a single value of 22500000 for both 48000Hz and 44100Hz audio
will sometimes result in returning wrong dividers due to rounding.
Update the code to use the actual value for both.

Fixes: 294833fc ("ASoC: wm8940: Rewrite code to set proper clocks")
Reported-by: Ankur Tyagi <ankur.tyagi85@gmail.com>
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Tested-by: Ankur Tyagi <ankur.tyagi85@gmail.com>
Link: https://patch.msgid.link/20250821082639.1301453-2-ckeepax@opensource.cirrus.com


Signed-off-by: Mark Brown <broonie@kernel.org>