ASoC: cs42l42: Fix LRCLK frame start edge

[ Upstream commit 0c2f2ad4

 ]

An I2S frame starts on the falling edge of LRCLK so ASP_STP must
be 0.

At the same time, move other format settings in the same register
from cs42l42_pll_config() to cs42l42_set_dai_fmt() where you'd
expect to find them, and merge into a single write.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Fixes: 2c394ca7

 ("ASoC: Add support for CS42L42 codec")
Link: https://lore.kernel.org/r/20210805161111.10410-2-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>