Add LOCAL_LICENSE_KINDS to external/libunwind

Added SPDX-license-identifier-Apache-2.0 SPDX-license-identifier-MIT to:
  Android.bp

Bug: 68860345
Bug: 151177513
Bug: 151953481

Test: m all
Change-Id: I3d58148e2f876769613d2e24eb3f64dec793fe22
1 file changed