Merge "Include sys/types.h for pid_t" am: fd31e824ed

Original change: https://android-review.googlesource.com/c/platform/system/extras/+/2380776

Change-Id: I17abdb41a4de4fa45bf1a505f2282ce6a24414c5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>