dts: bindings: charger: max20335: use enum for property

Add enum for `constant-charge-voltage-max-microvolt` property to
signalize improper values given with device tree at compile time.

Signed-off-by: Lukasz Madej <l.madej@grinn-global.com>

doc/releases/migration-guide-3.7.rst

@@ -80,6 +80,9 @@ Charger
 * Dropped ``constant-charge-current-max-microamp`` property in ``charger_max20335`` driver because
   it did not reflect real chip functionality.
 
+* Added enum key to ``constant-charge-voltage-max-microvolt`` property in ``maxim,max20335-charger``
+  binding to indicate invalid devicetree values at build time.
+
 Controller Area Network (CAN)
 =============================
 

dts/bindings/charger/maxim,max20335-charger.yaml

@@ -10,6 +10,19 @@ compatible: "maxim,max20335-charger"
 properties:
   constant-charge-voltage-max-microvolt:
     required: true
+    enum:
+      - 4050000
+      - 4100000
+      - 4150000
+      - 4200000
+      - 4250000
+      - 4300000
+      - 4350000
+      - 4400000
+      - 4450000
+      - 4500000
+      - 4550000
+      - 4600000
 
   chgin-to-sys-current-limit-microamp:
     type: int