scripts: dtc: Add .gitignore

Ignore these generated files during the build of dtc.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/scripts/dtc/.gitignore b/scripts/dtc/.gitignore
new file mode 100644
index 0000000..d807c08
--- /dev/null
+++ b/scripts/dtc/.gitignore
@@ -0,0 +1,4 @@
+/dtc
+/dtc-lexer.lex.c
+/dtc-parser.tab.c
+/dtc-parser.tab.h