imx: move serial driver to drivers/serial

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/include/configs/scb9328.h b/include/configs/scb9328.h
index 10db535..2f166c9 100644
--- a/include/configs/scb9328.h
+++ b/include/configs/scb9328.h
@@ -29,6 +29,7 @@
 #define CONFIG_SCB9328		1     /* on a scb9328tronix board */
 #undef	CONFIG_USE_IRQ		      /* don't need use IRQ/FIQ	   */
 
+#define CONFIG_IMX_SERIAL
 #define CONFIG_IMX_SERIAL1
 /*
  * Select serial console configuration