Update min Vulkan version to 1.0.8.0, and fix various bugs

src/gpu/vk/GrVkStencilAttachment.cpp

Index: src/gpu/vk/GrVkStencilAttachment.cpp
diff --git a/src/gpu/vk/GrVkStencilAttachment.cpp b/src/gpu/vk/GrVkStencilAttachment.cpp
index 97597fc5118e7e239b19c876a67b76cd2c7770b0..a3d3af345a5a75f93260ca8be520ba5d4c5bdc52 100644
--- a/src/gpu/vk/GrVkStencilAttachment.cpp
+++ b/src/gpu/vk/GrVkStencilAttachment.cpp
@@ -42,7 +42,8 @@ GrVkStencilAttachment* GrVkStencilAttachment::Create(GrVkGpu* gpu,
     imageDesc.fLevels = 1;
     imageDesc.fSamples = sampleCnt;
     imageDesc.fImageTiling = VK_IMAGE_TILING_OPTIMAL;
-    imageDesc.fUsageFlags = VK_IMAGE_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT;
+    imageDesc.fUsageFlags = VK_IMAGE_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT |
+                            VK_IMAGE_USAGE_TRANSFER_DST_BIT;
     imageDesc.fMemProps = VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT;
 
     const GrVkImage::Resource* imageResource = GrVkImage::CreateResource(gpu, imageDesc);