[][openwrt-24][common][bsp][Add .gitignore]

[Description]
Add the .gitignore file

[Release-log]
N/A

Change-Id: Ied6b5168a264959dcb31e61ad2f06985b02a0995
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/9275992
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..272f073
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.coverity/