drm/mipi-dbi: 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.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Anusha Srivatsa <asrivats@redhat.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250226172457.217725-10-tzimmermann@suse.de

Author: tdz

drivers/gpu/drm/drm_mipi_dbi.c

@@ -218,7 +218,7 @@ int mipi_dbi_buf_copy(void *dst, struct iosys_map *src, struct drm_framebuffer *
 	switch (fb->format->format) {
 	case DRM_FORMAT_RGB565:
 		if (swap)
-			drm_fb_swab(&dst_map, NULL, src, fb, clip, !gem->import_attach,
+			drm_fb_swab(&dst_map, NULL, src, fb, clip, !drm_gem_is_imported(gem),
 				    fmtcnv_state);
 		else
 			drm_fb_memcpy(&dst_map, NULL, src, fb, clip);