Include migration/vmstate.h less

In my "build everything" tree, changing migration/vmstate.h triggers a
recompile of some 2700 out of 6600 objects (not counting tests and
objects that don't depend on qemu/osdep.h).

hw/hw.h supposedly includes it for convenience.  Several other headers
include it just to get VMStateDescription.  The previous commit made
that unnecessary.

Include migration/vmstate.h only where it's still needed.  Touching it
now recompiles only some 1600 objects.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20190812052359.30071-16-armbru@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>

hw/watchdog/cmsdk-apb-watchdog.c

@@ -31,6 +31,7 @@
 #include "hw/irq.h"
 #include "hw/registerfields.h"
 #include "hw/watchdog/cmsdk-apb-watchdog.h"
+#include "migration/vmstate.h"
 
 REG32(WDOGLOAD, 0x0)
 REG32(WDOGVALUE, 0x4)

hw/watchdog/wdt_aspeed.c

@@ -17,6 +17,7 @@
 #include "hw/misc/aspeed_scu.h"
 #include "hw/sysbus.h"
 #include "hw/watchdog/wdt_aspeed.h"
+#include "migration/vmstate.h"
 
 #define WDT_STATUS                      (0x00 / 4)
 #define WDT_RELOAD_VALUE                (0x04 / 4)

hw/watchdog/wdt_diag288.c

@@ -17,6 +17,7 @@
 #include "hw/sysbus.h"
 #include "qemu/timer.h"
 #include "hw/watchdog/wdt_diag288.h"
+#include "migration/vmstate.h"
 #include "qemu/log.h"
 #include "qemu/module.h"
 

hw/watchdog/wdt_i6300esb.c

@@ -26,6 +26,7 @@
 #include "sysemu/watchdog.h"
 #include "hw/hw.h"
 #include "hw/pci/pci.h"
+#include "migration/vmstate.h"
 
 /*#define I6300ESB_DEBUG 1*/
 

hw/watchdog/wdt_ib700.c

@@ -25,6 +25,7 @@
 #include "sysemu/watchdog.h"
 #include "hw/hw.h"
 #include "hw/isa/isa.h"
+#include "migration/vmstate.h"
 
 /*#define IB700_DEBUG 1*/