owners: update OWNERS.chromeos_sie

Add oscarliu@ to owners/sie/OWNERS.chromeos_sie

BUG=None
TEST=None

Change-Id: I0f150605609c6fbcc3ad248fbf2e45b7c8169093
Reviewed-on: https://chrome-internal-review.googlesource.com/c/chromeos/owners/+/8713616
Reviewed-by: Knox Chiou <knoxchiou@google.com>
Commit-Queue: Oscar Liu <oscarliu@google.com>
Auto-Submit: Oscar Liu <oscarliu@google.com>
Tested-by: Oscar Liu <oscarliu@google.com>
diff --git a/sie/OWNERS.chromeos_sie b/sie/OWNERS.chromeos_sie
index 5faf1a7..cb1af2c 100644
--- a/sie/OWNERS.chromeos_sie
+++ b/sie/OWNERS.chromeos_sie
@@ -20,6 +20,7 @@
 nsale@google.com
 nsanders@google.com
 oferfried@google.com
+oscarliu@google.com
 reinauer@google.com
 rickytlchang@google.com
 shawnku@google.com