KVM: powerpc: Show timing option only on embedded

Embedded PowerPC KVM has an exit timing implementation to track and evaluate
how much time was spent in which exit path.

For Book3S, we don't implement it. So let's not expose it as a config option
either.
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/powerpc/kvm/Kconfig

@@ -53,7 +53,7 @@ config KVM_440
 
 config KVM_EXIT_TIMING
 	bool "Detailed exit timing"
-	depends on KVM
+	depends on KVM_440 || KVM_E500
 	---help---
 	  Calculate elapsed time for every exit/enter cycle. A per-vcpu
 	  report is available in debugfs kvm/vm#_vcpu#_timing.