LinkStation: fix compiler warning, add a maintainer

out_8 wants a pointer to an unsigned as the first argument. Add a
maintainer for Linkstation boards.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
diff --git a/board/linkstation/hwctl.c b/board/linkstation/hwctl.c
index 9db128a..2e5b5c8 100644
--- a/board/linkstation/hwctl.c
+++ b/board/linkstation/hwctl.c
@@ -27,7 +27,7 @@
 /*--------------------------------------------------------------*/
 static inline void miconCntl_SendUart(unsigned char dat)
 {
-	out_8((char *)AVR_PORT, dat);
+	out_8((unsigned char *)AVR_PORT, dat);
 	mdelay(1);
 }