x86/xen: put setup.c, pmu.c and apic.c under CONFIG_XEN_PV

xen_pmu_init/finish() functions are used in suspend.c and
enlighten.c, add stubs for now.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
index 6d15c34..3bcb091 100644
--- a/arch/x86/xen/Kconfig
+++ b/arch/x86/xen/Kconfig
@@ -6,7 +6,6 @@
 	bool "Xen guest support"
 	depends on PARAVIRT
 	select PARAVIRT_CLOCK
-	select XEN_HAVE_VPMU
 	depends on X86_64 || (X86_32 && X86_PAE)
 	depends on X86_LOCAL_APIC && X86_TSC
 	help
@@ -19,6 +18,7 @@
 	default y
 	depends on XEN
 	select XEN_HAVE_PVMMU
+	select XEN_HAVE_VPMU
 	help
 	  Support running as a Xen PV guest.