dt-bindings: pwm: brcm,bcm7038: Do not require pwm-cells twice
pwm-cells property is already required by pwm.yaml schema.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
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