ASoC: rt1318: Use maple tree register cache

The rt1318 can only support single register read and write operations
so does not benefit from block writes. This means it gets no benefit from
using the rbtree register cache over the maple tree register cache so
convert it to use maple trees instead, it is more modern.
Tested-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230609-asoc-rt-sdw-maple-v1-8-85ee50c93905@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/rt1318-sdw.c

@@ -337,7 +337,7 @@ static const struct regmap_config rt1318_sdw_regmap = {
 	.max_register = 0x41081488,
 	.reg_defaults = rt1318_reg_defaults,
 	.num_reg_defaults = ARRAY_SIZE(rt1318_reg_defaults),
-	.cache_type = REGCACHE_RBTREE,
+	.cache_type = REGCACHE_MAPLE,
 	.use_single_read = true,
 	.use_single_write = true,
 };