arm64: dts: qcom: qcs404: add the watchdog node

Allows QCS404 based designs to enable watchdog support

Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>