tools: env: Add embedded.c to .gitignore

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/tools/env/.gitignore b/tools/env/.gitignore
index 804abac..8d28b2b 100644
--- a/tools/env/.gitignore
+++ b/tools/env/.gitignore
@@ -1,2 +1,3 @@
+embedded.c
 fw_printenv
 fw_printenv_unstripped