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>
diff --git a/hw/input/pl050.c b/hw/input/pl050.c
index 3092b0f..be9cd57 100644
--- a/hw/input/pl050.c
+++ b/hw/input/pl050.c
@@ -10,6 +10,7 @@
 #include "qemu/osdep.h"
 #include "hw/sysbus.h"
 #include "hw/input/ps2.h"
+#include "qemu/log.h"
 
 #define TYPE_PL050 "pl050"
 #define PL050(obj) OBJECT_CHECK(PL050State, (obj), TYPE_PL050)