soc/mediatek: Add MTK blob owners

Set MTK bringup team firmware developers to be owner of mediatek
sub folder since there will be very frequent updates to memory
training blobs.

BUG=None
TEST=None

Change-Id: Idd889fd4383295a3568d63d7f6834bf52a7466d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/coreboot/blobs/+/1918503
Tested-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Commit-Queue: Hung-Te Lin <hungte@chromium.org>
Auto-Submit: Hung-Te Lin <hungte@chromium.org>
diff --git a/soc/mediatek/OWNERS b/soc/mediatek/OWNERS
new file mode 100644
index 0000000..e26614f
--- /dev/null
+++ b/soc/mediatek/OWNERS
@@ -0,0 +1,2 @@
+hungte@chromium.org
+yupingso@chromium.org