drm/panel: ili9322: 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: Mark Brown <broonie@kernel.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231001-drm-sn65dsi83-maple-v1-2-5519799a55e5@kernel.org

drivers/gpu/drm/panel/panel-ilitek-ili9322.c

@@ -337,7 +337,7 @@ static const struct regmap_config ili9322_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
 	.max_register = 0x44,
-	.cache_type = REGCACHE_RBTREE,
+	.cache_type = REGCACHE_MAPLE,
 	.writeable_reg = ili9322_writeable_reg,
 };