arm64: dts: qcom: sdm845: Add the RPMh stats node

SDM845 is a special case compared to the other platforms that use RPMh
stats, since it only has 2 stats (aosd and cxsd), while the others have
a 3rd one (ddr).

So lets add the node but with a SDM845 dedicated compatible to make
the driver aware of the different stats config.

Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Tested-by: Caleb Connolly <caleb.connolly@linaro.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220812101240.1869605-3-abel.vesa@linaro.org