Vulkan: Enable UtilsVk::startRenderPass() for DS Currently, UtilsVk::startRenderPass() assumes usage for color ops and only uses color aspect flags and layouts. This CL will add the option to use it for depth/stencil as well. * Added the aspect flags to the args of startRenderPass() * For the existing usage of this function, which use the color bit, the image layout "ColorWrite" is used as before. * For depth/stencil usage, the layout to be used therein will be DepthWriteStencilWrite. * The follow-up CL will use this. Bug: angleproject:42266869 Change-Id: I135df3b91064b6e711e6109e9e7b734bc6361396 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5801657 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Charlie Lao <cclao@google.com> Commit-Queue: Amirali Abdolrashidi <abdolrashidi@google.com>