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/idmr/u-boot.lds b/board/idmr/u-boot.lds
index 713b18a..588a128 100644
--- a/board/idmr/u-boot.lds
+++ b/board/idmr/u-boot.lds
@@ -60,7 +60,7 @@
     arch/m68k/lib/traps.o		(.text)
     cpu/mcf52x2/interrupts.o	(.text)
     common/dlmalloc.o		(.text)
-    lib_generic/zlib.o		(.text)
+    lib/zlib.o		(.text)
 
     . = DEFINED(env_offset) ? env_offset : .;
     common/env_embedded.o	(.ppcenv)