firmware provingground: add relevant owners

BUG=none
TEST=none

Change-Id: Ie6361b31fe4d17515aeb9b78a6ddca0c7e03b7d5
Reviewed-on: https://chromium-review.googlesource.com/1708315
Tested-by: Kevin Shelton <kmshelton@chromium.org>
Commit-Ready: Kevin Shelton <kmshelton@chromium.org>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Aashutosh Kalyankar <aashutoshk@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
diff --git a/provingground/firmware/OWNERS b/provingground/firmware/OWNERS
new file mode 100644
index 0000000..0b5dad8
--- /dev/null
+++ b/provingground/firmware/OWNERS
@@ -0,0 +1,3 @@
+dgoyette@chromium.org
+gredelston@chromium.org
+kmshelton@chromium.org