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/board/gateworks/gw_ventana/gw_ventana.c b/board/gateworks/gw_ventana/gw_ventana.c
index 2ef213c..acbd200 100644
--- a/board/gateworks/gw_ventana/gw_ventana.c
+++ b/board/gateworks/gw_ventana/gw_ventana.c
@@ -7,6 +7,7 @@
 
 #include <common.h>
 #include <init.h>
+#include <log.h>
 #include <net.h>
 #include <asm/arch/clock.h>
 #include <asm/arch/crm_regs.h>