common: Use new numeric setenv functions

Use setenv_ulong(), setenv_hex() and setenv_addr() in common/

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/cmd_nvedit.c b/common/cmd_nvedit.c
index 44e88aa..d646d90 100644
--- a/common/cmd_nvedit.c
+++ b/common/cmd_nvedit.c
@@ -891,8 +891,7 @@
 		envp->flags = ACTIVE_FLAG;
 #endif
 	}
-	sprintf(buf, "%zX", (size_t)(len + offsetof(env_t, data)));
-	setenv("filesize", buf);
+	setenv_hex("filesize", len + offsetof(env_t, data));
 
 	return 0;