KVM: PPC: Support eventfd

In order to support the generic eventfd infrastructure on PPC, we need
to call into the generic KVM in-kernel device mmio code.

Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/arch/powerpc/kvm/Kconfig b/arch/powerpc/kvm/Kconfig
index 71f0cd9..4730c95 100644
--- a/arch/powerpc/kvm/Kconfig
+++ b/arch/powerpc/kvm/Kconfig
@@ -20,6 +20,7 @@
 	bool
 	select PREEMPT_NOTIFIERS
 	select ANON_INODES
+	select HAVE_KVM_EVENTFD
 
 config KVM_BOOK3S_HANDLER
 	bool