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/usb/eth/lan7x.c b/drivers/usb/eth/lan7x.c
index afe78d4..0a28361 100644
--- a/drivers/usb/eth/lan7x.c
+++ b/drivers/usb/eth/lan7x.c
@@ -4,6 +4,7 @@
  */
 
 #include <dm.h>
+#include <log.h>
 #include <malloc.h>
 #include <miiphy.h>
 #include <memalign.h>