Add support for Linux-like kallsysms

The kernel stores address<->symbol names in it so things can be decoded at
runtime.  Do it in U-Boot, and we get nice symbol decoding when crashing.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

common/system_map.c

@@ -0,0 +1,8 @@
+/*
+ * The builtin symbol table for use with kallsyms
+ *
+ * Copyright (c) 2008-2009 Analog Devices Inc.
+ * Licensed under the GPL-2 or later.
+ */
+
+const char const system_map[] = SYSTEM_MAP;