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

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

board/westel/amx860/u-boot.lds.debug

diff --git a/board/westel/amx860/u-boot.lds.debug b/board/westel/amx860/u-boot.lds.debug
index 7a7a40c..dbd1f9d 100644
--- a/board/westel/amx860/u-boot.lds.debug
+++ b/board/westel/amx860/u-boot.lds.debug
@@ -62,7 +62,7 @@
     lib_ppc/extable.o	(.text)
 
     . = env_offset;
-    common/environment.o(.text)
+    common/env_embedded.o(.text)
 
     *(.text)
     *(.fixup)