v3dv: only require texel-size alignment for linear images

Originally, copies between buffers and images required a buffer offset
that was a multiple of 4 bytes, however, the spec was later fixed to
relax this rule and only require offsets that had texel alignment.

Our implementation of image to buffer copies using the blit path needs
to bind the destination buffer as a linear image and be able to bind
the requested buffer memory at the required offset, so for that to work
we need to chnage the alignment requirements for linear images to match
the relaxed texel alignment requirement.

Fixes new tests in Vulkan CTS 1.2.4:
dEQP-VK.api.copy_and_blit.core.image_to_buffer.buffer_offset_relaxed
dEQP-VK.api.copy_and_blit.dedicated_allocation.image_to_buffer.buffer_offset_relaxed

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6766>

src/broadcom/vulkan/v3dv_image.c

@@ -211,7 +211,8 @@ v3d_setup_slices(struct v3dv_image *image)
     *
     * We additionally align to 4k, which improves UIF XOR performance.
     */
-   image->alignment = image->tiling == VK_IMAGE_TILING_LINEAR ? 4 : 4096;
+   image->alignment =
+      image->tiling == VK_IMAGE_TILING_LINEAR ? image->cpp : 4096;
    uint32_t align_offset =
       align(image->slices[0].offset, image->alignment) - image->slices[0].offset;
    if (align_offset) {