update branch for CI -> 2.x

Signed-off-by: Karl W Schulz <karl.schulz@amd.com>

.github/workflows/mi100.yml

@@ -3,7 +3,7 @@ name: mi100
 on:
   pull_request:
     branches:
-      - 'ci'
+      - '2.x'
 
   # Allows manual execution
   workflow_dispatch: