[LSC] Add LOCAL_LICENSE_KINDS to external/xz-embedded

Added legacy_unencumbered to:
  Android.bp

Bug: 68860345
Bug: 151177513
Bug: 151953481

Test: m all

Exempt-From-Owner-Approval: janitorial work
Change-Id: I6cdef9939822acbd5da529ee9cefcd152883a2fe
1 file changed