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/xilinx/ml300/u-boot.lds.debug b/board/xilinx/ml300/u-boot.lds.debug
index 0552994..338392a 100644
--- a/board/xilinx/ml300/u-boot.lds.debug
+++ b/board/xilinx/ml300/u-boot.lds.debug
@@ -61,7 +61,7 @@
     lib_generic/crc32.o		(.text)
     lib_ppc/extable.o	(.text)
 
-    common/environment.o(.text)
+    common/env_embedded.o(.text)
 
     *(.text)
     *(.fixup)