KVM: arm64: Enable private memory kconfig for arm64

Now that the infrastructure is in place for arm64 to support
guest private memory, enable it in the arm64 kernel
configuration.

Signed-off-by: Fuad Tabba <tabba@google.com>
diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
index 27ca89b..83a1418 100644
--- a/arch/arm64/kvm/Kconfig
+++ b/arch/arm64/kvm/Kconfig
@@ -39,6 +39,8 @@
 	select SCHED_INFO
 	select GUEST_PERF_EVENTS if PERF_EVENTS
 	select XARRAY_MULTI
+	select KVM_GENERIC_PRIVATE_MEM
+	select KVM_GENERIC_PRIVATE_MEM_MAPPABLE
 	help
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