[LSC] Add LOCAL_LICENSE_KINDS to external/dtc

Added SPDX-license-identifier-BSD SPDX-license-identifier-BSD-2-Clause to:
  libfdt/Android.bp

Added SPDX-license-identifier-BSD SPDX-license-identifier-BSD-2-Clause
    SPDX-license-identifier-GPL SPDX-license-identifier-GPL-2.0
    SPDX-license-identifier-ISC SPDX-license-identifier-LGPL
    SPDX-license-identifier-LGPL-2.1
to:
  Android.bp

Bug: 68860345
Bug: 151177513
Bug: 151953481

Test: m all

Exempt-From-Owner-Approval: janitorial work
Change-Id: I77e096e006ed52d651da76a924f09da18696311c