[Blackfin] arch: add include/boot .gitignore files

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

diff --git a/include/asm-blackfin/.gitignore b/include/asm-blackfin/.gitignore
new file mode 100644
index 0000000..7858564
--- /dev/null
+++ b/include/asm-blackfin/.gitignore
@@ -0,0 +1 @@
++mach