regulator: rtmv20: Fix to make regcache value first reading back from HW

- Fix to make regcache value first reading back from HW.
Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
Link: https://lore.kernel.org/r/1622542155-6373-1-git-send-email-u0084500@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/rtmv20-regulator.c

@@ -27,6 +27,7 @@
 #define RTMV20_REG_LDIRQ	0x30
 #define RTMV20_REG_LDSTAT	0x40
 #define RTMV20_REG_LDMASK	0x50
+#define RTMV20_MAX_REGS		(RTMV20_REG_LDMASK + 1)
 
 #define RTMV20_VID_MASK		GENMASK(7, 4)
 #define RICHTEK_VID		0x80
@@ -313,6 +314,7 @@ static const struct regmap_config rtmv20_regmap_config = {
 	.val_bits = 8,
 	.cache_type = REGCACHE_RBTREE,
 	.max_register = RTMV20_REG_LDMASK,
+	.num_reg_defaults_raw = RTMV20_MAX_REGS,
 
 	.writeable_reg = rtmv20_is_accessible_reg,
 	.readable_reg = rtmv20_is_accessible_reg,