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_omap.c b/drivers/serial/serial_omap.c
index 4d4d919..f7997fc 100644
--- a/drivers/serial/serial_omap.c
+++ b/drivers/serial/serial_omap.c
@@ -9,6 +9,7 @@
 #include <common.h>
 #include <dm.h>
 #include <dt-structs.h>
+#include <log.h>
 #include <ns16550.h>
 #include <serial.h>
 #include <clk.h>