drm/panfrost: Test for imported buffers with drm_gem_is_imported()

drm/panfrost: Test for imported buffers with drm_gem_is_imported()

Instead of testing import_attach for imported GEM buffers, invoke
drm_gem_is_imported() to do the test. The test itself does not change.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Boris Brezillon <boris.brezillon@collabora.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Steven Price <steven.price@arm.com>
Cc: "Adrián Larumbe" <adrian.larumbe@collabora.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Link: https://patch.msgid.link/20260227133113.235940-7-tzimmermann@suse.de