arm64: dts: qcom: qcs404: Define remaining UARTs

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

Note that these has not been tested.

Reviewed-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>