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/doc/README.alaska8220 b/doc/README.alaska8220
index 0bd68d9..279dac6 100644
--- a/doc/README.alaska8220
+++ b/doc/README.alaska8220
@@ -22,7 +22,7 @@
 - include/asm-ppc/global_data.h added global variables - inp_clk, pci_clk,
 			    vco_clk, pev_clk, flb_clk, and bExtUart
 
-- lib_ppc/board.c	    added CONFIG_MPC8220 support
+- arch/ppc/lib/board.c	    added CONFIG_MPC8220 support
 
 - net/eth.c		    added FEC support for MPC8220