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/snmc/qs850/u-boot.lds b/board/snmc/qs850/u-boot.lds
index 2410d5f..f1de08b 100644
--- a/board/snmc/qs850/u-boot.lds
+++ b/board/snmc/qs850/u-boot.lds
@@ -66,7 +66,7 @@
 	lib_ppc/time.o		(.text)
 
     . = DEFINED(env_offset) ? env_offset : .;
-	common/environment.o	(.ppcenv)
+	common/env_embedded.o	(.ppcenv)
 
     *(.text)
     *(.fixup)