mfd: stpmic1: Convert to use maple tree register cache

The maple tree register cache is based on a much more modern data structure
than the rbtree cache and makes optimisation choices which are probably
more appropriate for modern systems than those made by the rbtree cache.
Signed-off-by: Bo Liu <liubo03@inspur.com>
Link: https://lore.kernel.org/r/20240206071314.8721-18-liubo03@inspur.comSigned-off-by: Lee Jones <lee@kernel.org>

drivers/mfd/stpmic1.c

@@ -63,7 +63,7 @@ static const struct regmap_access_table stpmic1_volatile_table = {
 static const struct regmap_config stpmic1_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
-	.cache_type = REGCACHE_RBTREE,
+	.cache_type = REGCACHE_MAPLE,
 	.max_register = PMIC_MAX_REGISTER_ADDRESS,
 	.rd_table = &stpmic1_readable_table,
 	.wr_table = &stpmic1_writeable_table,