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/mips/cputimer.c b/hw/mips/cputimer.c
index 9ad13f3..e0266bf 100644
--- a/hw/mips/cputimer.c
+++ b/hw/mips/cputimer.c
@@ -21,7 +21,7 @@
  */
 
 #include "hw/hw.h"
-#include "hw/mips_cpudevs.h"
+#include "hw/mips/cpudevs.h"
 #include "qemu/timer.h"
 
 #define TIMER_FREQ	100 * 1000 * 1000