ARM: dts: qcom: msm8974: correct pronto unit-address

Match unit-address to reg entry to fix dtbs W=1 warnings:

  Warning (simple_bus_reg): /soc/remoteproc@fb21b000: simple-bus unit address format error, expected "fb204000"

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230420075053.41976-3-krzysztof.kozlowski@linaro.org