CL/Vulkan: Remove spurious clear The external events corresponding to a command stream submit and processed and cleared before vkSubmit. So remove the spurious clear at the time finish post processing. Bug: angleproject:446112158 Change-Id: If2efcc3173e400ad2d386ca374eebe9d9f310692 Signed-off-by: Gowtham Tammana <g.tammana@samsung.com> Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6981089 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Austin Annestrand <a.annestrand@samsung.com>