dt-bindings: regulator: Add TI TPS65214 PMIC bindings

- TPS65214 is a Power Management IC with 3 Buck regulators and 2 LDOs.
- TPS65214 has 2 LDOS and 1 GPO, whereas TPS65219 has 4 LDOs and 2 GPOs.
- TPS65214's LDO1 maps to TPS65219's LDO3.
- A key difference between TPS65215 & TPS65214 are the LDO current and
voltage output ranges and the configurable options available.
- The remaining features for both devices are the same.

Signed-off-by: Shree Ramamoorthy <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Lee Jones <[e-mail]>

Documentation/devicetree/bindings/regulator/ti,tps65219.yaml

···
 $id: http://devicetree.org/schemas/regulator/ti,tps65219.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: TI TPS65215/TPS65219 Power Management Integrated Circuits
+title: TI TPS65214/TPS65215/TPS65219 Power Management Integrated Circuit
 
 maintainers:
   - Jerome Neanne <[e-mail]>
···
   TI TPS65215 is a derivative of TPS65219 with 3 Buck regulators, 2 Low
   Drop-out Regulators (LDOs), 1 GPIO, 1 GPO, and power-button.
 
+  TI TPS65214 is a derivative of TPS65219 with 3 Buck regulators, 2 Low
+  Drop-out Regulators (LDOs), 1 GPIO, 1 GPO, and power-button.
+
 properties:
   compatible:
     enum:
+      - ti,tps65214
       - ti,tps65215
       - ti,tps65219
 
···
       properties:
         compatible:
           contains:
-            const: ti,tps65215
+            enum:
+              - ti,tps65214
+              - ti,tps65215
     then:
       properties:
         regulators: