add authorization for Xinyu Zhang and Karl Zhang

Change-Id: Ib4f2058e3d094ac389ee320e6d60486cc495c3c0
Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
diff --git a/tf-m-build-and-test.yaml b/tf-m-build-and-test.yaml
index 6bb5a82..a51b79c 100644
--- a/tf-m-build-and-test.yaml
+++ b/tf-m-build-and-test.yaml
@@ -50,6 +50,16 @@
             - job-build
             - job-cancel
             - run-update
+          karl-zh:
+            - job-read
+            - job-extended-read
+            - job-build
+            - job-cancel
+          xinyu-tfm:
+            - job-read
+            - job-extended-read
+            - job-build
+            - job-cancel
       - throttle:
           max-total: 5
           option: project