hw: cannot include hw/hw.h from user emulation

All qdev definitions are available from other headers, user-mode
emulation does not need hw/hw.h.

By considering system emulation only, it is simpler to disentangle
hw/hw.h from NEED_CPU_H.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index da5d081..b6a3caa 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -34,7 +34,6 @@
 #include "qapi/visitor.h"
 #include "sysemu/arch_init.h"
 
-#include "hw/hw.h"
 #if defined(CONFIG_KVM)
 #include <linux/kvm_para.h>
 #endif
@@ -43,6 +42,7 @@
 #include "hw/qdev-properties.h"
 #ifndef CONFIG_USER_ONLY
 #include "exec/address-spaces.h"
+#include "hw/hw.h"
 #include "hw/xen/xen.h"
 #include "hw/i386/apic_internal.h"
 #endif