Add service_contexts to embedded.mk.
Add service_contexts to embedded.mk.

Add service_contexts to embedded.mk to support MAC checks in the
service manager.

Bug: 12909011
Change-Id: I31f4f4e1acb2be8167f2f11f93c936c18303135a
xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build