hw: move private headers to hw/ subdirectories.

Many headers are used only in a single directory.  These can be
kept in hw/.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

hw/lm32/lm32_boards.c

@@ -25,8 +25,8 @@
 #include "hw/loader.h"
 #include "sysemu/blockdev.h"
 #include "elf.h"
-#include "hw/lm32_hwsetup.h"
-#include "hw/lm32.h"
+#include "lm32_hwsetup.h"
+#include "lm32.h"
 #include "exec/address-spaces.h"
 
 typedef struct {