travis: remove Arm64 jobs from allow_failures
travis: remove Arm64 jobs from allow_failures

VM jobs makes the test on Arm64 more stable and efficient
and no abnormal interruption of jobs was observed.

Signed-off-by: Jianlin Lv <752eae91a476c3d35f9a7fd15fcd40979a048de4@arm.com>

tgraf/cilium,cilium-team/cilium,cilium/cilium,michi-covalent/cilium,michi-covalent/cilium,tklauser/cilium,tgraf/cilium,tgraf/cilium,tgraf/cilium,cilium-team/cilium,michi-covalent/cilium,cilium/cilium,tgraf/cilium,michi-covalent/cilium,tklauser/cilium,tklauser/cilium,cilium/cilium,tgraf/cilium,tklauser/cilium,tklauser/cilium,cilium/cilium,cilium/cilium,michi-covalent/cilium