Fix MSAN unitialized memory in vulkan memory allocator.

Bug: skia:12821
Change-Id: Iaadc9c5d2723b0973e46e121f27d204c5cfaa657
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/494477
Auto-Submit: Greg Daniel <egdaniel@google.com>
Reviewed-by: Christopher Dalton <csmartdalton@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>

src/gpu/vk/GrVkAMDMemoryAllocator.cpp

diff --git a/src/gpu/vk/GrVkAMDMemoryAllocator.cpp b/src/gpu/vk/GrVkAMDMemoryAllocator.cpp
index a742604..0885aac 100644
--- a/src/gpu/vk/GrVkAMDMemoryAllocator.cpp
+++ b/src/gpu/vk/GrVkAMDMemoryAllocator.cpp
@@ -170,6 +170,7 @@
         case BufferUsage::kTransfersFromCpuToGpu:
             info.requiredFlags =
                     VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT;
+            info.preferredFlags = 0;
             break;
         case BufferUsage::kTransfersFromGpuToCpu:
             info.requiredFlags = VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT;