CAS: Move OWNERS file from default to base folder

Bug: None
Test: None
Change-Id: I1d59460821ab23ba20fb88dc4072bb3a0bf055b4
diff --git a/cas/aidl/default/OWNERS b/cas/aidl/OWNERS
similarity index 100%
rename from cas/aidl/default/OWNERS
rename to cas/aidl/OWNERS