hw: explicitly include qemu/log.h

Move the inclusion out of hw/hw.h, most files do not need it.

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

hw/timer/digic-timer.c

@@ -30,6 +30,7 @@
 #include "hw/sysbus.h"
 #include "hw/ptimer.h"
 #include "qemu/main-loop.h"
+#include "qemu/log.h"
 
 #include "hw/timer/digic-timer.h"