gitignore: Add cscope files

Add cscope files in gitignore.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Message-Id: <3c39a6324ef2be64f839e6e6205f4afc63486216.1612338199.git.viresh.kumar@linaro.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
1 file changed