KVM: s390: arm64: Integrate arm on s390

Add all Kbuild/Makefile configurations to build a second KVM module on
s390 implementing the arm64 KVM API. The new module is named kvm_arm64.

Symbol conflicts with kvm_s390 are prevented by localising all internal
symbols in kvm_arm64 when compiled as built-in (=y): kvm-unnamespaced.o
holds all constituent objects. objcopy --localize-symbols then produces
kvm-namespaced.o which is what kvm-arm64.o resolves to. For =m the
normal module symbol scoping applies and no localisation step is needed.

Because the %-arm64.o pattern targets do not match any kvm-arm64-y entry,
kbuild would derive a wrong KBUILD_MODNAME (e.g. "kvm_main_arm64") and
a wrong KBUILD_MODFILE for the virt/kvm and gmap copies.

Co-developed-by: Andreas Grapentin <gra@linux.ibm.com>
Signed-off-by: Andreas Grapentin <gra@linux.ibm.com>
Co-developed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Signed-off-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Co-developed-by: Gautam Gala <ggala@linux.ibm.com>
Signed-off-by: Gautam Gala <ggala@linux.ibm.com>
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>

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