[RFC v1 08/18] PCI: fu740: Allow asynchronous probing for background link training

[Frank Li]

From: Frank Li (AI-BOT) <frank.li at nxp.com>

Commit message has a typo:

> Fix the identation of the callback functions.

Should be "indentation" (two 'n's).

The code changes look good otherwise. The indentation fix aligns with kernel
style (8-char tabs), and adding PROBE_PREFER_ASYNCHRONOUS is a straightforward
addition that matches the stated intent.

AI bot review and may be useless.