Rename lib_generic/ to lib/

Now that the other architecture-specific lib directories have been
moved out of the top-level directory there's not much reason to have the
'_generic' suffix on the common lib directory.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/board/freescale/m54451evb/u-boot.spa b/board/freescale/m54451evb/u-boot.spa
index 569518b..e63b1f2 100644
--- a/board/freescale/m54451evb/u-boot.spa
+++ b/board/freescale/m54451evb/u-boot.spa
@@ -62,7 +62,7 @@
     common/dlmalloc.o		(.text)
     common/main.o		(.text)
     common/image.o		(.text)
-    lib_generic/libgeneric.a	(.text)
+    lib/libgeneric.a	(.text)
 
     . = DEFINED(env_offset) ? env_offset : .;
     common/env_embedded.o	(.text)