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/kup/kup4k/u-boot.lds b/board/kup/kup4k/u-boot.lds
index 2e9169c..466a8f2 100644
--- a/board/kup/kup4k/u-boot.lds
+++ b/board/kup/kup4k/u-boot.lds
@@ -65,7 +65,7 @@
     lib_generic/zlib.o		(.text)
 
     . = env_offset;
-    common/environment.o(.text)
+    common/env_embedded.o(.text)
 */
 
     *(.text)