m68k: Add vmlinux.lds to .gitignore

arch/m68k/kernel/.gitignore: Added vmlinux.lds to .gitignore file because it
shouldn't be tracked.

Signed-off-by: Kars de Jong <jongk@linux-m68k.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

arch/m68k/kernel/.gitignore

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