Move lib_$ARCH directories to arch/$ARCH/lib

Also move lib_$ARCH/config.mk to arch/$ARCH/config.mk

This change is intended to clean up the top-level directory structure
and more closely mimic Linux's directory organization.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/board/freescale/m53017evb/u-boot.lds b/board/freescale/m53017evb/u-boot.lds
index c79d06c..fe0e314 100644
--- a/board/freescale/m53017evb/u-boot.lds
+++ b/board/freescale/m53017evb/u-boot.lds
@@ -57,7 +57,7 @@
 
     cpu/mcf532x/start.o		(.text)
     cpu/mcf532x/libmcf532x.a	(.text)
-    lib_m68k/libm68k.a		(.text)
+    arch/m68k/lib/libm68k.a		(.text)
     common/dlmalloc.o		(.text)
     lib_generic/zlib.o		(.text)