arm: rmobile: silk: fix typo in device declaration

Fix typo in device declaration

Signed-off-by: Vladimir Barinov <vladimir.barinov+renesas@cogentembedded.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/board/renesas/silk/silk.c b/board/renesas/silk/silk.c
index c97a2a0..1838c4b 100644
--- a/board/renesas/silk/silk.c
+++ b/board/renesas/silk/silk.c
@@ -179,7 +179,7 @@
 	.clk_mode = EXT_CLK,
 };
 
-U_BOOT_DEVICE(alt_serials) = {
+U_BOOT_DEVICE(silk_serials) = {
 	.name = "serial_sh",
 	.platdata = &serial_platdata,
 };