dt-bindings: soc: qcom: wcnss: Add firmware-name property

The WCNSS needs firmware which differs between platforms, and possibly
boards. Add a new property "firmware-name" to allow the DT to specify
the platform/board specific path to this firmware file.

Acked-by: Rob Herring <robh@kernel.org>
Tested-by: Aníbal Limón <anibal.limon@linaro.org>
Link: https://lore.kernel.org/r/20210312003318.3273536-2-bjorn.andersson@linaro.org


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>