CL/VK: Fix enqueueFillImage & enqueueMapImage lock and waitlist Fix in enqueueFillImage and enqueueMapImage. Semantically should be using scoped lock and processWaitlist() instead of enqueueWaitForEvents(). Bug: angleproject:390387802 Change-Id: I86173a079aa7fdd54a8b7158ec8214147cfb7cd2 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6179619 Reviewed-by: Austin Annestrand <a.annestrand@samsung.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>