v3d: DRM_FORMAT_MOD_BROADCOM_SAND128 only available for NV12 format.

We were exposing as available DRM_FORMAT_MOD_BROADCOM_SAND128 for
any format.

Fixes: 95c4f0f910 "v3d: Enables DRM_FORMAT_MOD_BROADCOM_SAND128 support"
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10524>

src/gallium/drivers/v3d/v3d_screen.c

@@ -651,6 +651,10 @@ v3d_screen_query_dmabuf_modifiers(struct pipe_screen *pscreen,
         int i;
         int num_modifiers = ARRAY_SIZE(v3d_available_modifiers);
 
+        /* Expose DRM_FORMAT_MOD_BROADCOM_SAND128 only for PIPE_FORMAT_NV12 */
+        if (format != PIPE_FORMAT_NV12)
+                num_modifiers--;
+
         if (!modifiers) {
                 *count = num_modifiers;
                 return;