kvm/arm64: set accessType when signal is SIGSEGV
kvm/arm64: set accessType when signal is SIGSEGV

Only when PageFault happened, we need set accessType in order to
mapping the fault address.
Otherwise, it would trap in endless loop when exit vector is
El0ErrNMI or El0SyncUndef.

Signed-off-by: Howard Zhang <90ec7750b2604c925990bbc10f98dfe9138a4c1a@arm.com>

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