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/m548xevb/u-boot.lds b/board/freescale/m548xevb/u-boot.lds
index a3014bd..5f28a10 100644
--- a/board/freescale/m548xevb/u-boot.lds
+++ b/board/freescale/m548xevb/u-boot.lds
@@ -56,8 +56,8 @@
     /* the sector layout of our flash chips!	XXX FIXME XXX	*/
 
     cpu/mcf547x_8x/start.o		(.text)
-    lib_m68k/traps.o		(.text)
-    lib_m68k/interrupts.o	(.text)
+    arch/m68k/lib/traps.o		(.text)
+    arch/m68k/lib/interrupts.o	(.text)
     common/dlmalloc.o		(.text)
 
     . = DEFINED(env_offset) ? env_offset : .;