pxa: move serial driver to drivers/serial

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/include/configs/csb226.h b/include/configs/csb226.h
index ed18450..12bab47 100644
--- a/include/configs/csb226.h
+++ b/include/configs/csb226.h
@@ -53,6 +53,7 @@
 /*
  * select serial console configuration
  */
+#define CONFIG_PXA_SERIAL
 #define CONFIG_FFUART		1	/* we use FFUART on CSB226          */
 
 /* allow to overwrite serial and ethaddr */