ASoC: cs42l43: Use fls to calculate the pre-divider for the PLL

Use fls to calculate the pre-divider and input frequency for the PLL,
this is marginally faster than the previous loop.
Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://msgid.link/r/20240125103117.2622095-7-ckeepax@opensource.cirrus.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/cs42l43.c

@@ -1338,10 +1338,9 @@ static int cs42l43_enable_pll(struct cs42l43_codec *priv)
 
 	dev_dbg(priv->dev, "Enabling PLL at %uHz\n", freq);
 
-	while (freq > cs42l43_pll_configs[ARRAY_SIZE(cs42l43_pll_configs) - 1].freq) {
-		div++;
-		freq /= 2;
-	}
+	div = fls(freq) -
+	      fls(cs42l43_pll_configs[ARRAY_SIZE(cs42l43_pll_configs) - 1].freq);
+	freq >>= div;
 
 	if (div <= CS42L43_PLL_REFCLK_DIV_MASK) {
 		int i;