sound-open-firmware: add OWNERS file

BUG=b:132095048
TEST=None

Change-Id: Id7dfbb1c9622aa00735cc71a197c43583e5bfe28
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/sound-open-firmware/+/1677325
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..db88559
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1,3 @@
+dgreid@chromium.org
+benzh@chromium.org
+cujomalainey@chromium.org