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/cris/axis_dev88.c b/hw/cris/axis_dev88.c
index eccd423..00daceb 100644
--- a/hw/cris/axis_dev88.c
+++ b/hw/cris/axis_dev88.c
@@ -24,9 +24,9 @@
 
 #include "hw/sysbus.h"
 #include "net/net.h"
-#include "hw/flash.h"
+#include "hw/block/flash.h"
 #include "hw/boards.h"
-#include "hw/etraxfs.h"
+#include "hw/cris/etraxfs.h"
 #include "hw/loader.h"
 #include "elf.h"
 #include "hw/cris-boot.h"