Switch makefile owners to MK_OWNERS

Bug: 278167548
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:aa3eb14d33c1b5f93fb7f496eb625f3829d1325d)
Merged-In: I58886a7c812960f7ef7d14a4d9c0b0ccabd4b8ef
Change-Id: I58886a7c812960f7ef7d14a4d9c0b0ccabd4b8ef
1 file changed