pxa: move serial driver to drivers/serial

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/include/configs/cradle.h b/include/configs/cradle.h
index 75c5f9b..b150c22 100644
--- a/include/configs/cradle.h
+++ b/include/configs/cradle.h
@@ -57,6 +57,7 @@
 /*
  * select serial console configuration
  */
+#define CONFIG_PXA_SERIAL
 #define CONFIG_FFUART          1       /* we use FFUART on LUBBOCK */
 
 /* allow to overwrite serial and ethaddr */