CL/VK: Add writeBuffer to staging/transfer routine Adding enqueueWriteBuffer staging/transfer code/routine for the non-blocking conditions. Bug: angleproject:377545840 Change-Id: Ia2f97588a887e9ec30f8f1715b0e33b56ff97867 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6023865 Commit-Queue: Austin Annestrand <a.annestrand@samsung.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>