Give automotive team ownership of the default Vehicle HAL implementation

Test: read file
Change-Id: I32db85f45ebe38c128415f0fa3cb7ccca66d4a97
Exempt-From-Owner-Approval: smoreland@ suggested we take ownership of this subdirectory
diff --git a/automotive/vehicle/2.0/default/OWNERS b/automotive/vehicle/2.0/default/OWNERS
new file mode 100644
index 0000000..d5d9d4c
--- /dev/null
+++ b/automotive/vehicle/2.0/default/OWNERS
@@ -0,0 +1,3 @@
+egranata@google.com
+pavelm@google.com
+spaik@google.com