External CI: enable trigger for amd-mainline (#189)

Signed-off-by: Su, Daniel <Daniel.Su@amd.com>

.azuredevops/rocm-ci.yml

@@ -14,6 +14,7 @@ trigger:
   branches:
     include:
     - amd-staging
+    - amd-mainline
   paths:
     exclude:
     - .github
@@ -27,6 +28,7 @@ pr:
   branches:
     include:
     - amd-staging
+    - amd-mainline
   paths:
     exclude:
     - .github