Makefile: rename all libraries to built-in.o

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/board/matrix_vision/mvsmr/u-boot.lds b/board/matrix_vision/mvsmr/u-boot.lds
index 08ce014..e885b7c 100644
--- a/board/matrix_vision/mvsmr/u-boot.lds
+++ b/board/matrix_vision/mvsmr/u-boot.lds
@@ -18,7 +18,7 @@
     /* the first two sectors (=8KB) of our S29GL flash chip */
     arch/powerpc/cpu/mpc5xxx/start.o	(.text*)
     arch/powerpc/cpu/mpc5xxx/traps.o	(.text*)
-    board/matrix_vision/common/libmatrix_vision.o (.text*)
+    board/matrix_vision/common/built-in.o	(.text*)
 
     /* This is only needed to force failure if size of above code will ever */
     /* increase and grow into reserved space. */