Documentation: devicetree: bindings: regulator: palmas-pmic.txt

Adding support for the tps659038 pmic so it doesn't generate a warning
when running the patch check script to
Documentation/devicetree/bindings/regulator/palmas-pmic.txt

Adding a note that the tps659037 device is a OTP spin of the
tps659038 pmic and device compatible.
Signed-off-by: Schuyler Patton <spatton@ti.com>
Signed-off-by: Keerthy <j-keerthy@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/regulator/palmas-pmic.txt

 * palmas regulator IP block devicetree bindings
 
+The tps659038 for the AM57x class have OTP spins that
+have different part numbers but the same functionality. There
+is not a need to add the OTP spins to the palmas driver. The
+spin devices should use the tps659038 as it's compatible value.
+This is the list of those devices:
+tps659037
+
 Required properties:
 - compatible : Should be from the list
   ti,twl6035-pmic
@@ -8,6 +15,7 @@ Required properties:
   ti,tps65913-pmic
   ti,tps65914-pmic
   ti,tps65917-pmic
+  ti,tps659038-pmic
 and also the generic series names
   ti,palmas-pmic
 - interrupt-parent : The parent interrupt controller which is palmas.