Remove AmigaOneG3SE board

The AmigaOneG3SE board has been orphaned or a very long time, and
broken for more than 12 releases resp. more than 3 years.  As nobody
seems to be interested any more in this stuff we may as well ged rid
of it, especially as it clutters many areas of the code so it is a
continuous pain for all kinds of ongoing work.

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/common/main.c b/common/main.c
index f7e7c1c..3760ba3 100644
--- a/common/main.c
+++ b/common/main.c
@@ -427,14 +427,7 @@
 	    }
 	}
 #endif /* CONFIG_MENUKEY */
-#endif	/* CONFIG_BOOTDELAY */
-
-#ifdef CONFIG_AMIGAONEG3SE
-	{
-	    extern void video_banner(void);
-	    video_banner();
-	}
-#endif
+#endif /* CONFIG_BOOTDELAY */
 
 	/*
 	 * Main Loop for Monitor Command Processing