gpuservice: add OWNERS file

Test: build, flash and boot
Change-Id: Ie86fd3617dce72318135cb5753c4ab5991ffe36b
diff --git a/services/gpuservice/OWNERS b/services/gpuservice/OWNERS
new file mode 100644
index 0000000..5d02839
--- /dev/null
+++ b/services/gpuservice/OWNERS
@@ -0,0 +1,3 @@
+chrisforbes@google.com
+lpy@google.com
+zzyiwei@google.com