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.stm b/board/freescale/m54451evb/u-boot.stm
index 0752e27..e9eac67 100644
--- a/board/freescale/m54451evb/u-boot.stm
+++ b/board/freescale/m54451evb/u-boot.stm
@@ -68,7 +68,7 @@
     board/freescale/m54455evb/m54455evb.o	(.text)
 
     . = DEFINED(env_offset) ? env_offset : .;
-    common/environment.o	(.text)
+    common/env_embedded.o	(.text)
 */
     *(.text)
     *(.fixup)