FROMLIST: arm64: dts: qcom: qcs404: Define remaining uarts

Add the BLSP2 BAM and define the remaining four UARTs found on the
QCS404 platform.

Note that these has not been tested.

(am from https://lore.kernel.org/lkml/20181118200135.25258-3-bjorn.andersson@linaro.org/

)
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>