regulator: fan53555: add chip id for Silergy SYR83X

SYR83X is used in Rockpro64 and it has die ID == 9. All other
registers are the same as in SYR82X
Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Link: https://lore.kernel.org/r/20191106161211.1700663-1-anarsoul@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/fan53555.c

@@ -83,6 +83,7 @@ enum {
 
 enum {
 	SILERGY_SYR82X = 8,
+	SILERGY_SYR83X = 9,
 };
 
 struct fan53555_device_info {
@@ -302,6 +303,7 @@ static int fan53555_voltages_setup_silergy(struct fan53555_device_info *di)
 	/* Init voltage range and step */
 	switch (di->chip_id) {
 	case SILERGY_SYR82X:
+	case SILERGY_SYR83X:
 		di->vsel_min = 712500;
 		di->vsel_step = 12500;
 		break;