Provide a vdso_install target in the arm64 Makefile, as other architectures
with a vdso do.
Signed-off-by: NKyle McMartin <kyle@redhat.com>
Acked-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>