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>

board/c2mon/u-boot.lds.debug

@@ -57,8 +57,8 @@ SECTIONS
 
     cpu/mpc8xx/start.o	(.text)
     common/dlmalloc.o	(.text)
-    lib_generic/vsprintf.o	(.text)
-    lib_generic/crc32.o		(.text)
+    lib/vsprintf.o	(.text)
+    lib/crc32.o		(.text)
 
     . = env_offset;
     common/env_embedded.o(.text)