drivers: power: regulator: tps65941_regulator: Add support for 3Phase buck

Buck regulator 1, 2 and 3 of TPS6594132 on j721e-sk is in 3 Phase
confguration, in-order to support this, add configuring 3 Phase buck
in tps65941 while driver probing.

Signed-off-by: Sinthu Raja <sinthu.raja@ti.com>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
diff --git a/drivers/power/regulator/tps65941_regulator.c b/drivers/power/regulator/tps65941_regulator.c
index d73f832..89918c3 100644
--- a/drivers/power/regulator/tps65941_regulator.c
+++ b/drivers/power/regulator/tps65941_regulator.c
@@ -299,6 +299,8 @@
 		idx = 1;
 	} else if (idx == 34) {
 		idx = 3;
+	} else if (idx == 123) {
+		idx = 1;
 	} else if (idx == 1234) {
 		idx = 1;
 	} else {