ARM: dts: msm: add apps watchdog node for msmtitanium

Add watchdog node to device tree to enable configuring the watchdog
timer to cause barks and bites so as to detect system hangs.

Change-Id: I0f734c8b8e0d81790de0af1b65de8aec5c8befdc
Signed-off-by: Charan Teja Reddy <charante@codeaurora.org>