rename environment.c in env_embedded.c to reflect is functionality

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/board/freescale/m54451evb/u-boot.spa b/board/freescale/m54451evb/u-boot.spa
index 22c6048..08e184c 100644
--- a/board/freescale/m54451evb/u-boot.spa
+++ b/board/freescale/m54451evb/u-boot.spa
@@ -62,7 +62,7 @@
     lib_generic/zlib.o		(.text)
 
     . = DEFINED(env_offset) ? env_offset : .;
-    common/environment.o	(.text)
+    common/env_embedded.o	(.text)
 
     *(.text)
     *(.fixup)