ARM: dts: msm: Add core hang detection to dt

Add qcom,msm-hang-detect to device tree to enable MSM Core Hang
Detection on all cores.

Changed from 2 nodes (one for each of silver and gold) to 1 node because
that's semantically correct for the driver.

Change-Id: I10be3a765e20460f43ce4a8cb5e6580d99439f46