.gitignore: Add bzip2 compressed files

We can have bzip2 compressed images nowadays.

Signed-off-by: Gertjan van Wingerde <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
diff --git a/.gitignore b/.gitignore
index b93fb7e..946c7ec 100644
--- a/.gitignore
+++ b/.gitignore
@@ -25,6 +25,7 @@
 *.elf
 *.bin
 *.gz
+*.bz2
 *.lzma
 *.patch
 *.gcno