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/drivers/net/ftmac110.c b/drivers/net/ftmac110.c
index 10d5fc3..835346c 100644
--- a/drivers/net/ftmac110.c
+++ b/drivers/net/ftmac110.c
@@ -8,6 +8,7 @@
 
 #include <common.h>
 #include <command.h>
+#include <log.h>
 #include <malloc.h>
 #include <net.h>
 #include <asm/cache.h>