nvk: Bump the sparse alignment requirement on buffers to 64K

Otherwise, if they live in VRAM, binding might fail.

Fixes: 03f0f01904 ("nvk: Add support for sparse buffers")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30033>

src/nouveau/vulkan/nvk_buffer.c

@@ -28,7 +28,7 @@ nvk_get_buffer_alignment(const struct nvk_physical_device *pdev,
 
    if (create_flags & (VK_BUFFER_CREATE_SPARSE_BINDING_BIT |
                        VK_BUFFER_CREATE_DEVICE_ADDRESS_CAPTURE_REPLAY_BIT))
-      alignment = MAX2(alignment, 4096);
+      alignment = MAX2(alignment, NVK_SPARSE_BIND_ALIGN_B);
 
    return alignment;
 }

src/nouveau/vulkan/nvk_private.h

@@ -35,6 +35,8 @@
 /* Max size of a bound cbuf */
 #define NVK_MAX_CBUF_SIZE (1u << 16)
 
+#define NVK_SPARSE_BIND_ALIGN_B (1u << 16)
+
 struct nvk_addr_range {
    uint64_t addr;
    uint64_t range;