arm64: dts: qcom: sdm845-xiaomi-beryllium: set venus firmware path

Enable loading the Qualcomm Venus video accelerator firmware on Xiaomi Pocophone F1.

Signed-off-by: Kate Doeen <jld3103yt@gmail.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211028102016.106063-1-jld3103yt@gmail.com