Add cscope.out to .gitignore
Add cscope.out to .gitignore

With this, git doesn't complain about uncommited change if one uses
cscope.

BUG=none
TEST='git status' and see no uncommited change.
BRANCH=none

Change-Id: I30bb78e4d0a7541444ef1aced683335933a5aa73
Signed-off-by: Vic Yang <5fd92abeee651458f98e2856f4f200ee971cee4d@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/49457
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>
Reviewed-by: Vincent Palatin <70a9964ec8fd10b0b08fcc8623c2add25ddf99ac@chromium.org>

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