arm64: dts: qcom: sdm845: Reduce reg size for aoss_qmp

Like on the other platforms that provide RPMh stats, on SDM845, the
aoss_qmp reg size needs to be reduced to its actual size of 0x400,
otherwise it will overlap with the RPMh stats reg base, node that will
be added later on.

Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220812101240.1869605-1-abel.vesa@linaro.org