hammerhead: prepare for new thermal engine

add 3rd party kernel compatibility for kernels without msm thermal engine

PS:
- add more specific syspath

Change-Id: I48f7a50ab519c0a35c5624c0b7e294767558732a
hammerhead: remove maxcpus which limits smp activation

we handle this all in kernel.

Change-Id: Iff6beebf06971cae17c7a3357f96acd647618c1b