Remove all gitignore entries for submodules

This is a follow up on crrev.com/c/4869241 to delete the rest of  git
submodules.

R=estaab

Change-Id: Ib3ea4e3c33fb1ae5b844d44275ca96d062060b7d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4877868
Reviewed-by: Erik Staab <estaab@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Commit-Queue: Dirk Pranke <dpranke@google.com>
Reviewed-by: Rick Byers <rbyers@chromium.org>
Auto-Submit: Josip Sokcevic <sokcevic@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1199376}
NOKEYCHECK=True
GitOrigin-RevId: 2406c51bd4c371e6d4e21a1204e6d1309cb7451b
1 file changed