accel/amdxdna: Fix missing import_attach in amdxdna_gem_prime_import

Set gobj->import_attach in amdxdna_gem_prime_import() so that
drm_gem_shmem_vmap_locked() takes the dma-buf import path instead of
calling drm_gem_get_pages() on an object with a NULL file pointer.

Without this, imported BOs (e.g. from virtio-gpu in QEMU) trigger a
WARNING in drm_gem_get_pages and vmap fails with -EINVAL.

Signed-off-by: Wendy Liang <wendy.liang@amd.com>

Author: wendyliang25

drivers/accel/amdxdna/amdxdna_gem.c

@@ -871,6 +871,7 @@ amdxdna_gem_prime_import(struct drm_device *dev, struct dma_buf *dma_buf)
 	abo->attach = attach;
 	abo->dma_buf = dma_buf;
 	abo->type = AMDXDNA_BO_SHARE;
+	gobj->import_attach = attach;
 	gobj->resv = dma_buf->resv;
 
 	return gobj;