soc: qcom: Add snapshot of watchdog driver

This is a snapshot of watchdog driver as of msm-4.19 commit
<5a4fd734e3e0e76c8e0819c47eb0d333e09d0f9f>. (Merge "msm: audio: support
for gapless_pcm").

Change-Id: I8b683c8b5c4c56f328d0025b2829f42105d03940
Signed-off-by: Prakruthi Deepak Heragu <pheragu@codeaurora.org>