dt-bindings: rtc: nxp,lpc1788-rtc: add compatible string nxp,lpc1850-rtc

Add compatible string nxp,lpc1850-rtc and fallback to nxp,lpc1788-rtc.

Fix below CHECK_DTB warning:
arch/arm/boot/dts/nxp/lpc/lpc4337-ciaa.dtb: rtc@40046000 (nxp,lpc1850-rtc): compatible: ['nxp,lpc1850-rtc', 'nxp,lpc1788-rtc'] is too long

Signed-off-by: Frank Li <[e-mail]>
Acked-by: Rob Herring (Arm) <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Alexandre Belloni <[e-mail]>

Documentation/devicetree/bindings/rtc/nxp,lpc1788-rtc.yaml

···
 
 properties:
   compatible:
-    const: nxp,lpc1788-rtc
+    oneOf:
+      - items:
+          - enum:
+              - nxp,lpc1850-rtc
+          - const: nxp,lpc1788-rtc
+      - const: nxp,lpc1788-rtc
 
   reg:
     maxItems: 1