graphics: add IMapper@2.1

Add necessary methods to protect the framework against crafted
buffer handles.

Bug: 62535446
Bug: 62084097
Bug: 32587089
Test: manual
Change-Id: I11486c0767a90788da9f84c2177202f26c0d9ce1
diff --git a/graphics/mapper/2.1/vts/OWNERS b/graphics/mapper/2.1/vts/OWNERS
new file mode 100644
index 0000000..ef69d7c
--- /dev/null
+++ b/graphics/mapper/2.1/vts/OWNERS
@@ -0,0 +1,6 @@
+# Graphics team
+olv@google.com
+
+# VTS team
+yim@google.com
+zhuoyao@google.com
\ No newline at end of file