common: Drop log.h from common header

Move this header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/sandbox/cpu/state.c b/arch/sandbox/cpu/state.c
index a347cec..1f79412 100644
--- a/arch/sandbox/cpu/state.c
+++ b/arch/sandbox/cpu/state.c
@@ -6,6 +6,7 @@
 #include <common.h>
 #include <errno.h>
 #include <fdtdec.h>
+#include <log.h>
 #include <os.h>
 #include <asm/malloc.h>
 #include <asm/state.h>