[automerger skipped] Merge "Don't inherit userspace_reboot.mk from mainline_system.mk" am: c3d679bb am: 46fe30f8 am: c1a02678 -s ours
am skip reason: Change-Id If910e2a6baf8acaafc8bafdf8193ba7237f66f1a with SHA-1 0f38beca is in history
Change-Id: Idbc16082b7321bb8231baefd8147ac4e61763efe