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>

board/mousse/u-boot.lds

@@ -53,8 +53,8 @@ SECTIONS
   .text      :
   {
     cpu/mpc824x/start.o		(.text)
-    lib_ppc/board.o		(.text)
-    lib_ppc/ppcstring.o		(.text)
+    arch/ppc/lib/board.o		(.text)
+    arch/ppc/lib/ppcstring.o		(.text)
     lib_generic/vsprintf.o	(.text)
     lib_generic/crc32.o		(.text)
     lib_generic/zlib.o		(.text)

board/mousse/u-boot.lds.rom

@@ -54,7 +54,7 @@ SECTIONS
   {
     cpu/mpc824x/start.o	(.text)
 	 common/board.o (.text)
-    lib_ppc/ppcstring.o	(.text)
+    arch/ppc/lib/ppcstring.o	(.text)
     lib_generic/vsprintf.o	(.text)
     lib_generic/crc32.o		(.text)
     lib_generic/zlib.o		(.text)