power: regulator: tps65941: Fix voltage calculation for ldo

As per TRM[0] Section 8.7.1 "TPS6594-Q1 Registers", LDOx_Vout
bit 6-1, define the NVM voltage settings.
Along side table 8-4 of above TRM, shows voltage to value mapping.

Driver wrongly using bits 5-1 to calculate voltage, and to convert
voltage to value driver was using buck's calculation.
So fix those calculation.

[0]: https://www.ti.com/lit/ds/symlink/tps6594-q1.pdf

Fixes: 5d7dbd22cf7d ("power: regulator: tps65941: use function callbacks for conversion ops")
Signed-off-by: Udit Kumar <u-kumar1@ti.com>
Reviewed-by: Neha Malcom Francis <n-francis@ti.com>
diff --git a/include/power/tps65941.h b/include/power/tps65941.h
index cec8533..a026ec5 100644
--- a/include/power/tps65941.h
+++ b/include/power/tps65941.h
@@ -21,10 +21,11 @@
 #define TPS65941_BUCK_VOLT_MAX		3340000
 #define TPS65941_BUCK_MODE_MASK		0x1
 
-#define TPS65941_LDO_VOLT_MASK		0x3E
+#define TPS65941_LDO_VOLT_MASK		0x7E
 #define TPS65941_LDO_VOLT_MAX_HEX	0x3A
 #define TPS65941_LDO_VOLT_MIN_HEX	0x4
 #define TPS65941_LDO_VOLT_MAX		3300000
+#define TPS65941_LDO_VOLT_MIN		600000
 #define TPS65941_LDO_MODE_MASK		0x1
 #define TPS65941_LDO_BYPASS_EN		0x80
 #define TP65941_BUCK_CONF_SLEW_MASK	0x7