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/include/configs/B2.h b/include/configs/B2.h
index f51a261..ca7350d 100644
--- a/include/configs/B2.h
+++ b/include/configs/B2.h
@@ -207,7 +207,7 @@
 */
 
 /*
-	Linux TAGs (see lib_arm/armlinux.c)
+	Linux TAGs (see arch/arm/lib/armlinux.c)
 */
 #define CONFIG_CMDLINE_TAG
 #undef CONFIG_SETUP_MEMORY_TAGS