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>

sound/soc/codecs/rt9120.c

@@ -372,7 +372,7 @@ static int rt9120_reg_read(void *context, unsigned int reg, unsigned int *val)
 		*val = be32_to_cpup((__be32 *)raw);
 		break;
 	case 3:
-		*val = raw[0] << 16 | raw[1] << 8 | raw[0];
+		*val = raw[0] << 16 | raw[1] << 8 | raw[2];
 		break;
 	case 2:
 		*val = be16_to_cpup((__be16 *)raw);