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/phy/mv88e61xx.c b/drivers/net/phy/mv88e61xx.c
index 5aff7ed..cbc3650 100644
--- a/drivers/net/phy/mv88e61xx.c
+++ b/drivers/net/phy/mv88e61xx.c
@@ -30,6 +30,7 @@
  */
 
 #include <common.h>
+#include <log.h>
 
 #include <bitfield.h>
 #include <errno.h>