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/rmu/u-boot.lds b/board/rmu/u-boot.lds
index 1f9a191..271ac76 100644
--- a/board/rmu/u-boot.lds
+++ b/board/rmu/u-boot.lds
@@ -64,7 +64,7 @@
 /* XXX ?
     . = env_offset;
 */
-    common/environment.o(.text)
+    common/env_embedded.o(.text)
 
     *(.text)
     *(.fixup)