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/engicam/common/board.c b/board/engicam/common/board.c
index 9483516..5a2003d 100644
--- a/board/engicam/common/board.c
+++ b/board/engicam/common/board.c
@@ -10,6 +10,7 @@
 #include <env.h>
 #include <hang.h>
 #include <init.h>
+#include <log.h>
 #include <mmc.h>
 #include <asm/arch/clock.h>
 #include <asm/arch/imx-regs.h>