ARM: dts: qcom: sdx55: Add Watchdog support

Enable Watchdog support for Application Processor Subsystem (APSS) block
on SDX55 platform.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20210118051005.55958-6-manivannan.sadhasivam@linaro.org


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