PXA270: Add support for multiple serial ports.

This patch adds support for multiple serial ports to the PXA target.
FFUART, BTUART and STUART are supported.

Signed-off-by: Stefano Babic <sbabic@denx.de>
diff --git a/lib_arm/board.c b/lib_arm/board.c
index d37e5da..d28afc5 100644
--- a/lib_arm/board.c
+++ b/lib_arm/board.c
@@ -314,6 +314,10 @@
 	drv_vfd_init();
 #endif /* CONFIG_VFD */
 
+#ifdef CONFIG_SERIAL_MULTI
+	serial_initialize();
+#endif
+
 	/* IP Address */
 	gd->bd->bi_ip_addr = getenv_IPaddr ("ipaddr");