leds: mt6370: Remove unused field 'reg_cfgs' from 'struct mt6370_priv'

In 'struct mt6370_priv', the 'reg_cfgs' field is unused. Moreover
'struct reg_cfg' isn't defined anywhere, so remove it.

Found with cppcheck, unusedStructMember.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/e389be5e1012dc05fc2641123883ca3b0747525a.1714328839.git.christophe.jaillet@wanadoo.frSigned-off-by: Lee Jones <lee@kernel.org>

drivers/leds/rgb/leds-mt6370-rgb.c

@@ -149,7 +149,6 @@ struct mt6370_priv {
 	struct regmap_field *fields[F_MAX_FIELDS];
 	const struct reg_field *reg_fields;
 	const struct linear_range *ranges;
-	struct reg_cfg *reg_cfgs;
 	const struct mt6370_pdata *pdata;
 	unsigned int leds_count;
 	unsigned int leds_active;