tests_l2: Remove service account for vpl dsa workload

Service account in the workload is not used by any SCC or RBAC

Signed-off-by: vbedida79 <veenadhari.bedida@intel.com>

Author: vbedida79

tests/l2/dgpu/intelvpl_job.yaml

@@ -19,4 +19,3 @@ spec:
           limits:
             gpu.intel.com/i915: 1
         imagePullPolicy: IfNotPresent
-      serviceAccountName: intel-dgpu