github-actions: Call main workflow directly for LTP testing

Call kernel-build-and-test-multiarch.yml@shreeya_kernelci_ltp_rebased
directly via workflow_call to test LTP jobs before merging to main.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: Shreeya Patel <spatel@ciq.com>

Author: shreeya-patel98

.github/workflows/kernel-build-and-test-multiarch-trigger.yml

@@ -20,5 +20,5 @@ jobs:
       github.event_name == 'push' ||
       github.event.pull_request.head.repo.full_name != github.repository ||
       github.event.action != 'opened'
-    uses: ctrliq/kernel-src-tree/.github/workflows/kernel-build-and-test-multiarch-trigger.yml@shreeya_kernelci_ltp_rebased
+    uses: ctrliq/kernel-src-tree/.github/workflows/kernel-build-and-test-multiarch.yml@shreeya_kernelci_ltp_rebased
     secrets: inherit