Add allenwebb@ to HWSec owners

BUG=b:533019508
TEST=pre-upload checks pass
Change-Id: Ia3de181542403fdd45ecf248dab19234530f86a1
Reviewed-on: https://chrome-internal-review.googlesource.com/c/chromeos/owners/+/9529915
Auto-Submit: Allen Webb <allenwebb@google.com>
Commit-Queue: Mary Ruthven <mruthven@google.com>
Reviewed-by: Mary Ruthven <mruthven@google.com>
Tested-by: Allen Webb <allenwebb@google.com>

firmware/OWNERS.cros_gsc

diff --git a/firmware/OWNERS.cros_gsc b/firmware/OWNERS.cros_gsc
index 49f2880..f04fe2a 100644
--- a/firmware/OWNERS.cros_gsc
+++ b/firmware/OWNERS.cros_gsc
@@ -2,6 +2,7 @@
 
 aaboagye@google.com
 abarnas@google.com
+allenwebb@google.com
 apronin@google.com
 crmullins@google.com
 marcinszymczyk@google.com