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/timer/imx_gpt.c b/hw/timer/imx_gpt.c
index ab2e213..3c2f01a 100644
--- a/hw/timer/imx_gpt.c
+++ b/hw/timer/imx_gpt.c
@@ -16,6 +16,7 @@
 #include "hw/timer/imx_gpt.h"
 #include "hw/misc/imx_ccm.h"
 #include "qemu/main-loop.h"
+#include "qemu/log.h"
 
 #ifndef DEBUG_IMX_GPT
 #define DEBUG_IMX_GPT 0