Add MK_OWNERS as owners file for makefile

Bug: 278167548
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:719071202775f584b02c313172b15496045009d8)
Merged-In: I9c1ac31c640c9f74434b993c9cc24332d6820cd0
Change-Id: I9c1ac31c640c9f74434b993c9cc24332d6820cd0
2 files changed