ASoC: rt9120: Fix 3byte read, valule offset typo

For RG 3byte read, the value order is  offset [0], [1], and [2].

Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
Link: https://lore.kernel.org/r/1652926418-8519-2-git-send-email-u0084500@gmail.com


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