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/ide/atapi.c b/hw/ide/atapi.c
index 861fd2b..05e60b1 100644
--- a/hw/ide/atapi.c
+++ b/hw/ide/atapi.c
@@ -24,7 +24,7 @@
  */
 
 #include "hw/ide/internal.h"
-#include "hw/scsi.h"
+#include "hw/scsi/scsi.h"
 
 static void ide_atapi_cmd_read_dma_cb(void *opaque, int ret);