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/bcm-sf2-eth.c b/drivers/net/bcm-sf2-eth.c
index 11f9370..c8393c5 100644
--- a/drivers/net/bcm-sf2-eth.c
+++ b/drivers/net/bcm-sf2-eth.c
@@ -4,6 +4,7 @@
  */
 
 #include <common.h>
+#include <log.h>
 #include <malloc.h>
 #include <net.h>
 #include <config.h>