arm64: dts: qcom: sm8450-nagara: Correct firmware paths

Nagara is definitely not SM8350, fix it!

Fixes: c53532f7 ("arm64: dts: qcom: pdx223: correct firmware paths")
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230203142309.1106349-1-konrad.dybcio@linaro.org