arm64: dts: renesas: beacon-renesom: Align wifi node name with bindings

Since commit 3c360679 ("dt-bindings: wireless: bcm4329-fmac: Use
wireless-controller.yaml schema"), bindings expect 'wifi' as node name:

  r8a774a1-beacon-rzg2m-kit.dtb: bcrmf@1: $nodename:0: 'bcrmf@1' does not match '^wifi(@.*)?$'

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20250424084748.105255-1-krzysztof.kozlowski@linaro.org


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>