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/serial/serial_zynq.c b/drivers/serial/serial_zynq.c
index 0dd6cec..5f2dcd6 100644
--- a/drivers/serial/serial_zynq.c
+++ b/drivers/serial/serial_zynq.c
@@ -10,6 +10,7 @@
 #include <dm.h>
 #include <errno.h>
 #include <fdtdec.h>
+#include <log.h>
 #include <watchdog.h>
 #include <asm/io.h>
 #include <dm/device_compat.h>