serial: punt unused serial_addr()

Only one file apparently defines this function, and it merely stubs
it out. So if no one is defining/calling it, punt it.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/board/barco/barco.c b/board/barco/barco.c
index d7a0078..c5fe8c4 100644
--- a/board/barco/barco.c
+++ b/board/barco/barco.c
@@ -340,10 +340,6 @@
 {
 	return;
 }
-void serial_addr (unsigned int i)
-{
-	return;
-}
 int serial_getc (void)
 {
 	return 0;
diff --git a/include/common.h b/include/common.h
index 5591e1d..8bca04f 100644
--- a/include/common.h
+++ b/include/common.h
@@ -470,7 +470,6 @@
 /* $(CPU)/serial.c */
 int	serial_init   (void);
 void	serial_exit   (void);
-void	serial_addr   (unsigned int);
 void	serial_setbrg (void);
 void	serial_putc   (const char);
 void	serial_putc_raw(const char);