ARM: dts: msm: Add wdog device for SDM855

This patch adds watchdog bark and bite time which are used to
configure the watchdog timer on SDM855. The watchdog is pet at
regular intervals otherwise the system is assumed to have become
non responsive and needs to be reset.

Change-Id: Ic919b0f720dfb9f911b3efe070d9033d9fadff5c
Signed-off-by: Rama Aparna Mallavarapu <aparnam@codeaurora.org>