arm64: dts: qcom: sc7280: Add wifi alias for SC7280-idp

Currently, depth-charge Chrome OS bootloader code used in the SC7280
SoC accesses the WiFi node using node names (wifi@<addr>). Since
depth-charge Chrome OS bootloader is a common code that is used in
SoCs having different WiFi chipsets, it is better if the depth-charge
Chrome OS bootloader code accesses the WiFi node using a WiFi alias.
The advantage of this method is that the depth-charge Chrome OS
bootloader code need not be changed for every new WiFi chip.
Therefore, add wifi alias entry for SC7280-idp device tree.

Signed-off-by: Youghandhar Chintala <quic_youghand@quicinc.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221228094104.356-1-quic_youghand@quicinc.com
