power: supply: bd99954: 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 <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Sebastian Reichel <[e-mail]>

drivers/power/supply/bd99954-charger.c

···
 	.reg_stride = 1,
 
 	.max_register = 3 * 0x100,
-	.cache_type = REGCACHE_RBTREE,
+	.cache_type = REGCACHE_MAPLE,
 
 	.ranges = regmap_range_cfg,
 	.num_ranges = ARRAY_SIZE(regmap_range_cfg),