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/v37/u-boot.lds b/board/v37/u-boot.lds
index 7bcf061..f4ea41e 100644
--- a/board/v37/u-boot.lds
+++ b/board/v37/u-boot.lds
@@ -68,7 +68,7 @@
 /*
     . = env_offset;
 */
-    common/environment.o	(.ppcenv)
+    common/env_embedded.o	(.ppcenv)
 
     *(.text)
     *(.fixup)