gitignore: misc files

Ignore all files generated from *_shipped files, plus a few others.

Signed-off-by: Brian Gerst <bgerst@didntduck.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/drivers/net/wan/.gitignore b/drivers/net/wan/.gitignore
new file mode 100644
index 0000000..dae3ea6
--- /dev/null
+++ b/drivers/net/wan/.gitignore
@@ -0,0 +1 @@
+wanxlfw.inc