drm/tests: shmem: Swap names of export tests

drm/tests: shmem: Swap names of export tests

GEM SHMEM has 2 helpers for exporting S/G tables. Swap the names of
the rsp. tests, so that each matches the helper it tests.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Fixes: 93032ae634d4 ("drm/test: add a test suite for GEM objects backed by shmem")
Cc: dri-devel@lists.freedesktop.org
Cc: <stable@vger.kernel.org> # v6.8+
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://patch.msgid.link/20251212160317.287409-2-tzimmermann@suse.de