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/siemens/IAD210/u-boot.lds b/board/siemens/IAD210/u-boot.lds
index 291f6b3..7a0d746 100644
--- a/board/siemens/IAD210/u-boot.lds
+++ b/board/siemens/IAD210/u-boot.lds
@@ -61,7 +61,7 @@
     cpu/mpc8xx/interrupts.o (.text)
     lib_ppc/time.o		(.text)
     . = env_offset;
-    common/environment.o(.text)
+    common/env_embedded.o(.text)
 
     *(.text)
     *(.fixup)