Expose the MacAddress class in the api

Test: built,  flashed, $ runtest frameworks-net
Bug: 69390696
Change-Id: Ica5efdf5ffe8ad2500a87f574508a2bcd074b33d
Merged-In: Ica5efdf5ffe8ad2500a87f574508a2bcd074b33d

(cherry picked from commit d411cf61ed5b948aaf6f6234217d6c6999c35159)
2 files changed