ASoC: rockchip: i2s: Add support for set bclk ratio

This patch adds support for set bclk ratio from machine driver.

Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
Link: https://lore.kernel.org/r/1629950520-14190-1-git-send-email-sugar.zhang@rock-chips.com


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