gw_ventana: Remove empty reset_cpu()

There is really no need to provide an empty reset_cpu() implementation,
so just remove it.

Cc: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Tim Harvey <tharvey@gateworks.com>

board/gateworks/gw_ventana/gw_ventana_spl.c

@@ -574,7 +574,3 @@ int spl_start_uboot(void)
 	return ret;
 }
 #endif
-
-void reset_cpu(ulong addr)
-{
-}