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/ip860/u-boot.lds b/board/ip860/u-boot.lds
index ef88297..8335364 100644
--- a/board/ip860/u-boot.lds
+++ b/board/ip860/u-boot.lds
@@ -63,7 +63,7 @@
     lib_ppc/ticks.o		(.text)
 /**
     . = env_offset;
-    common/environment.o(.text)
+    common/env_embedded.o(.text)
 **/
     *(.text)
     *(.fixup)