ASoC: rl6231: Add new supports on rl6231

Add pll preset maps for Realtek codecs' PLL2 freq conversions.

Signed-off-by: derek.fang <derek.fang@realtek.com>
Link: https://lore.kernel.org/r/1591938925-1070-2-git-send-email-derek.fang@realtek.com


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