[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>

arch/blackfin/boot/.gitignore

@@ -0,0 +1 @@
++vmImage

include/asm-blackfin/.gitignore

@@ -0,0 +1 @@
++mach