ASoC: rockchip-i2s: Undo BCLK pinctrl changes

The version of the BCLK pinctrl management changes that made it into
v5.19 has caused problems on some systems due to overly strict DT
requirements but attempts to fix it have caused further breakage on
other platforms.  Just drop the changes for this release, we already
have a better version queued for -next.

Fixes: 26b9f2fa ("ASoC: rockchip: i2s: Fix NULL pointer dereference when pinctrl is not found")
Fixes: a5450aba

 ("ASoC: rockchip: i2s: switch BCLK to GPIO")
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220713130451.31481-1-broonie@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>