dt-bindings: arm: lpc: add missed lpc43xx board

Add missed legancy lpc43xx board compatible string to fix below CHECK_DTB
warnings:
arch/arm/boot/dts/nxp/lpc/lpc4337-ciaa.dtb: /: failed to match any schema with compatible: ['ciaa,lpc4337', 'nxp,lpc4337', 'nxp,lpc4350']

Reviewed-by: Vladimir Zapolskiy <vz@mleia.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Frank Li <Frank.Li@nxp.com>

Author: nxpfrankli

Documentation/devicetree/bindings/arm/nxp/lpc32xx.yaml

@@ -22,5 +22,27 @@ properties:
               - phytec,phy3250
           - const: nxp,lpc3250
 
+      - items:
+          - enum:
+              - ea,lpc4357-developers-kit
+          - const: nxp,lpc4357
+          - const: nxp,lpc4350
+
+      - items:
+          - enum:
+              - ciaa,lpc4337
+          - const: nxp,lpc4337
+          - const: nxp,lpc4350
+
+      - items:
+          - enum:
+              - hitex,lpc4350-eval-board
+          - const: nxp,lpc4350
+
+      - items:
+          - enum:
+              - myir,myd-lpc4357
+          - const: nxp,lpc4357
+
 additionalProperties: true
 ...