Add camera-specific OWNER

Test: Builds
Change-Id: I86a08e487745640858028dd24f01e8f2c35aebca
diff --git a/OWNERS b/OWNERS
index 0c22ffd..da2454a 100644
--- a/OWNERS
+++ b/OWNERS
@@ -4,3 +4,4 @@
 malchev@google.com
 smoreland@google.com
 swillden@google.com
+per-file include/hardware/camera*=etalvala@google.com