remove include of utils/Log.h

Remove the include of utils/Log.h to avoid having to pull in liblog.
Add pthread.h because it was getting it implicitly through utils/Log.h.

Change-Id: Ib05b2934fe24cbb47eb4daf41cd392830caceeed
Merge tag 'tags/android-4.4_r1' into kitkat-staging

Android 4.4 Release 1.0