Add unistd.h for size_t typedef to fix sim-eng
Add unistd.h for size_t typedef to fix sim-eng

Change-Id: Ida4f1742547f39539b601f13182c722aa7cf863e

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base