Update base for Update on "[11/n][ET-VK] Introduce vTensor creation from external image"

Nearly all metadata is initialized to null/dummy values, except those absolutely needed in the pipeline: (1) image extents, (2) logical limits.

Differential Revision: [D63843819](https://our.internmc.facebook.com/intern/diff/D63843819/)

[ghstack-poisoned]

Author: jorgep31415

backends/vulkan/runtime/utils/AhbUtils.h

@@ -116,12 +116,12 @@ DescriptorSet& DescriptorSet::bind(
 DescriptorSet& DescriptorSet::bind(
     const uint32_t idx,
     const VulkanImage& image) {
-  // Check is only accurate for images allocated with VMA
-  if (image.vma_allocator() != VK_NULL_HANDLE) {
-    VK_CHECK_COND(
-        image.has_memory(),
-        "Image must be bound to memory for it to be usable");
-  }
+  // If the image does not have an allocator attached, then it is externally
+  // allocated; assume it is already bound to memory. Otherwise, it must be
+  // bound to a VmaAllocation to be used.
+  VK_CHECK_COND(
+      image.vma_allocator() == VK_NULL_HANDLE || image.has_memory(),
+      "Image must be bound to memory for it to be usable");
 
   VkImageLayout binding_layout = image.layout();
   if (shader_layout_signature_[idx] == VK_DESCRIPTOR_TYPE_STORAGE_IMAGE) {