arm64: dts: qcom: msm8996-*: Clean up QUP and UART names

QUP and UART names start from 1. There are 6 QUPs and 2 UARTs
per BLSP. Let's not further confuse programmers by stating
otherwise.

Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Link: https://lore.kernel.org/r/20210228130831.203765-2-konrad.dybcio@somainline.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>