Missing vendor name for venus firmware path. Add it.

Fixes: a41b6175 ("arm64: dts: qcom: sm8250: Add device tree for Xiaomi Mi Pad 5 Pro")
Signed-off-by: Jianhua Lu <lujianhua000@gmail.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230221123633.25145-1-lujianhua000@gmail.com