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.stm b/board/freescale/m54451evb/u-boot.stm
index 1b06b12..7c3f068 100644
--- a/board/freescale/m54451evb/u-boot.stm
+++ b/board/freescale/m54451evb/u-boot.stm
@@ -64,7 +64,7 @@
     arch/m68k/lib/board.o			(.text)
     common/serial.o			(.text)
     common/console.o			(.text)
-    lib_generic/display_options.o	(.text)
+    lib/display_options.o	(.text)
     board/freescale/m54455evb/m54455evb.o	(.text)
 
     . = DEFINED(env_offset) ? env_offset : .;