Add keyguard OWNERS for keyguard/ and some files in statusbar/.

Bug: NONE documentation only
Flag: NONE documentation only
Test: NONE
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:fa53f0a4e3b0358c2fcf21b5f7053fd4e1409868)
Merged-In: I3cf8897eaa9d2ad852c1198cdf9eb22658e872c1
Change-Id: I3cf8897eaa9d2ad852c1198cdf9eb22658e872c1
2 files changed