Update vulkan format features in caps.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1847963003

Review URL: https://codereview.chromium.org/1847963003
diff --git a/src/gpu/vk/GrVkImage.cpp b/src/gpu/vk/GrVkImage.cpp
index f91c6a9..7413630 100644
--- a/src/gpu/vk/GrVkImage.cpp
+++ b/src/gpu/vk/GrVkImage.cpp
@@ -58,6 +58,10 @@
     if (!GrSampleCountToVkSampleCount(imageDesc.fSamples, &vkSamples)) {
         return nullptr;
     }
+
+    SkASSERT(VK_IMAGE_TILING_OPTIMAL == imageDesc.fImageTiling ||
+             VK_SAMPLE_COUNT_1_BIT == vkSamples);
+
     const VkImageCreateInfo imageCreateInfo = {
         VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO,         // sType
         NULL,                                        // pNext