CL/VK: Add missing HostPtr-BufferVk sync on unmap Missing extra copy/sync for enqueueUnmapMemObject routine for USE_HOST_PTR scenario. Bug: angleproject:377366930 Change-Id: Ifcb0ed58beabf5870e00ed47b36cfd08767eba70 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5990104 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Austin Annestrand <a.annestrand@samsung.com> Reviewed-by: Geoff Lang <geofflang@chromium.org>