sparc: gitignore a few files

With this 'git status' no longer reports any new files
At least not for a sparc allnoconfig build

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/boot/.gitignore

@@ -0,0 +1,5 @@
+btfix.S
+btfixupprep
+image
+zImage
+

arch/sparc/kernel/.gitignore

@@ -0,0 +1 @@
+vmlinux.lds