arm64: dts: qcom: sc7180: add GO_LAZOR variant property for lazor

For trogdor, in the latest board-2.bin file, new BDF with variant
name GO_LAZOR has been introduced, so we need this property set, for
GO_LAZOR BDF to be picked.

Cc: Philip Chen <philipchen@chromium.org>
Signed-off-by: Abhishek Kumar <kuabhs@chromium.org>
[dianders: adjusted subject line and sort order]
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20210301133318.v2.9.I4a38fe64dd79c54af80d7e4ef5940f8cf4f86e75@changeid
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>