hw: move headers to include/

Many of these should be cleaned up with proper qdev-/QOM-ification.
Right now there are many catch-all headers in include/hw/ARCH depending
on cpu.h, and this makes it necessary to compile these files per-target.
However, fixing this does not belong in these patches.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/hw/openpic.c b/hw/openpic.c
index 03a7075..c788714 100644
--- a/hw/openpic.c
+++ b/hw/openpic.c
@@ -36,11 +36,11 @@
 #include "hw/hw.h"
 #include "hw/ppc/mac.h"
 #include "hw/pci/pci.h"
-#include "hw/openpic.h"
+#include "hw/ppc/openpic.h"
 #include "hw/sysbus.h"
 #include "hw/pci/msi.h"
 #include "qemu/bitops.h"
-#include "hw/ppc.h"
+#include "hw/ppc/ppc.h"
 
 //#define DEBUG_OPENPIC