Vulkan: Fix VVL error for black desert mobile When a depth stencil attachment is sampled in fragment shader and followed by sample from vertex shader, we are not hitting the readOnly to readOnly but with different shader stage code path. This is because IsShaderReadOnlyLayout is not counting VK_IMAGE_LAYOUT_DEPTH_STENCIL_READ_ONLY_OPTIMAL as shader read only, even though we are picking this layout for depth texture texture sampling just to avoid renderpass break when transit depth texture from read only depth attachment to shader read. Bug: angleproject:7186 Change-Id: I98c782ce85125a2ade953440145d6cc71d2c1dc1 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3629953 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Charlie Lao <cclao@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>