arm64: dts: qcom: Make -cells decimal

The property logically makes sense in decimal, and is the standard used
elsewhere.

Suggested-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Andrew Halaney <ahalaney@redhat.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Brian Masney <bmasney@redhat.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230501212446.2570364-3-ahalaney@redhat.com