passed the kvm test case of "TestApplicationFault" on Arm64 platform
passed the kvm test case of "TestApplicationFault" on Arm64 platform

For test case "TestApplicationFault",
Memory-fault in guest user level will be trapped in el0_da.
And in el0_da, we use mmio_exit to leave the KVM guest.

Signed-off-by: Bin Lu <41939a7239578d75c9fd5382ed581915f2bfc9f1@arm.com>

google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor