arm64: dts: qcom: sc7280-qcard: Add alias 'wifi0'

Add the alias 'wifi0' for the WiFi interface on the Qcard. The alias
is needed by the BIOS which patches the WiFi MAC address read from
the VPD (Vital Product Data) into the device tree.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220829094435.1.I4534cf408373478dd6e84dc8b9ddd0d4e1a3f143@changeid