ARM: chiliboard: remove dead !CONFIG_DM_SERIAL code

DM_SERIAL is selected by TARGET_CHILIBOARD, so there is no reason to
keep code that will not be built. Remove it.

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/board/grinn/chiliboard/board.c b/board/grinn/chiliboard/board.c
index 2bb91e3..dc0de62 100644
--- a/board/grinn/chiliboard/board.c
+++ b/board/grinn/chiliboard/board.c
@@ -19,7 +19,6 @@
 #include <environment.h>
 #include <errno.h>
 #include <miiphy.h>
-#include <serial.h>
 #include <spl.h>
 #include <watchdog.h>
 
@@ -69,13 +68,6 @@
 }
 #endif /* CONFIG_SKIP_LOWLEVEL_INIT */
 
-#ifndef CONFIG_DM_SERIAL
-struct serial_device *default_serial_console(void)
-{
-	return &eserial1_device;
-}
-#endif
-
 #ifndef CONFIG_SKIP_LOWLEVEL_INIT
 void set_uart_mux_conf(void)
 {