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/netta/u-boot.lds b/board/netta/u-boot.lds
index f560189..861f6ba 100644
--- a/board/netta/u-boot.lds
+++ b/board/netta/u-boot.lds
@@ -63,7 +63,7 @@
     lib_ppc/time.o		(.text)
 
     . = DEFINED(env_offset) ? env_offset : .;
-    common/environment.o	(.text)
+    common/env_embedded.o	(.text)
 
     *(.text)
     *(.fixup)