KVM: s390: arm64: Implement required functions

Implement the mostly trivial functions that the shared arm64 (kvm)
code & headers oblige s390 to implement.

MAINTAINERS: Add arch/s390/include/arm64/*

KVM: s390: arm64: Implement required functions

Implement the mostly trivial functions that the shared arm64 (kvm)
code & headers oblige s390 to implement.

MAINTAINERS: Add arch/s390/include/arm64/* to KVM/s390

Implement a very basic smccc handler that (non-compliantly) is just able
to stop a vcpu.

Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>

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