mfd: as3722: Make FUSE7_REG readable

The FUSE7_REG register is not currently marked readable. This causes
as3722_sd0_is_low_voltage() to emit an error during boot, and assume
the range of the SD0 regulator:

as3722-regulator as3722-regulator: Reg 0xa7 read failed: -5

Fixes: d4807ad2c4 ("regmap: Check readable regs in _regmap_read")
  [exposed the bug, by checking for readability]
Fixes: 762a8ee808 ("regulator: as3722: detect SD0 low-voltage mode")
  [left out this register from the readable list]

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/as3722.c

@@ -277,6 +277,7 @@ static const struct regmap_range as3722_readable_ranges[] = {
 	regmap_reg_range(AS3722_ADC0_CONTROL_REG, AS3722_ADC_CONFIGURATION_REG),
 	regmap_reg_range(AS3722_ASIC_ID1_REG, AS3722_ASIC_ID2_REG),
 	regmap_reg_range(AS3722_LOCK_REG, AS3722_LOCK_REG),
+	regmap_reg_range(AS3722_FUSE7_REG, AS3722_FUSE7_REG),
 };
 
 static const struct regmap_access_table as3722_readable_table = {