ARMv8: enable DM in vexpress64 board

Signed-off-by: David Feng <fenghua@phytium.com.cn>
diff --git a/board/armltd/vexpress64/vexpress64.c b/board/armltd/vexpress64/vexpress64.c
index de62864..071d88c 100644
--- a/board/armltd/vexpress64/vexpress64.c
+++ b/board/armltd/vexpress64/vexpress64.c
@@ -12,9 +12,22 @@
 #include <asm/io.h>
 #include <linux/compiler.h>
 #include <asm/semihosting.h>
+#include <dm/platdata.h>
+#include <dm/platform_data/serial_pl01x.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
+static const struct pl01x_serial_platdata serial_platdata = {
+	.base = V2M_UART0,
+	.type = TYPE_PL011,
+	.clock = 2400 * 1000,
+};
+
+U_BOOT_DEVICE(vexpress_serials) = {
+	.name = "serial_pl01x",
+	.platdata = &serial_platdata,
+};
+
 int board_init(void)
 {
 	return 0;