Add LOCAL_LICENSE_KINDS to external/mksh
Added SPDX-license-identifier-BSD SPDX-license-identifier-MIT
SPDX-license-identifier-Unicode-DFS legacy_notice
to:
Android.bp
Bug: 68860345
Bug: 151177513
Bug: 151953481
Test: m all
Exempt-From-Owner-Approval: janitorial work
Change-Id: Idf14d4318a318ee583c80d3f67fe5996e9c17e8d