Remove unnecessary srcAccessMask for preinitialized images in vulkan

src/gpu/vk/GrVkMemory.cpp

Index: src/gpu/vk/GrVkMemory.cpp
diff --git a/src/gpu/vk/GrVkMemory.cpp b/src/gpu/vk/GrVkMemory.cpp
index 7ad9b45987f9e5637c909596607237238cbc3dd1..e411d2d5418683bb8ad8e04580a3e8aea62c5c5b 100644
--- a/src/gpu/vk/GrVkMemory.cpp
+++ b/src/gpu/vk/GrVkMemory.cpp
@@ -225,7 +225,7 @@ VkAccessFlags GrVkMemory::LayoutToSrcAccessMask(const VkImageLayout layout) {
             VK_ACCESS_TRANSFER_WRITE_BIT |
             VK_ACCESS_HOST_WRITE_BIT | VK_ACCESS_HOST_READ_BIT;
     } else if (VK_IMAGE_LAYOUT_PREINITIALIZED == layout) {
-        flags = VK_ACCESS_HOST_WRITE_BIT | VK_ACCESS_HOST_READ_BIT;
+        flags = VK_ACCESS_HOST_WRITE_BIT;
     } else if (VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL == layout) {
         flags = VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT;
     } else if (VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL == layout) {