Add broadcom-wl driver for older intel macs

[discretizer]

This PR adds support for the broadcom-wl driver. By default it is disabled but can be enabled by modfiying the driver blacklist files like so:

mv /etc/modprobe.d/blacklist-wl.conf to /etc/modprobe.d/blacklist-wl.conf.disabled
mv /etc/modprobe.d/macbook-wifi.conf.disabled /etc/modprobe.d/macbook-wifi.conf
batocera-save-overlay

Additionally to get things to work a patch to wpa_supplicant is needed. The patch in this PR is taken from the following wpa_supplicant development thread:

https://lists.infradead.org/pipermail/hostap/2025-May/043475.html

This should fix an issue with the broadcom wl driver where AP scans don't work. This is a combination of two separate patches that are already in the upstream git repo, but not in the released version.

This PR resolves the following issue:
#7894

And replaces the older PR here:
#7735

To revert these changes just reverse the above renames
Tested on a Macmini7,1

[discretizer]

I kinda wish there was a better way to do some of these enabling steps. I've simplified this as much as possible. If anyone has any thoughts let me know - or just point me to some documentation I can update to add these steps.

I think the wpa_supplicant step was primarily what was missing from the earlier PR.

[dmanlfc]

This was confirmed as not working by multiple Mac users. I don't see what's changed...

[discretizer]

If there's a better way to handle this configuration quirk let me know. I'm fine if the eventual answer is "will not merge" (the driver is ancient anyway), I just want to get some documentation out there for how to make this work.

[discretizer]

Ok... there was ANOTHER wpa_supplicant bug. I made a PR into the buildroot repo to fix that one:

batocera-linux/buildroot#1054

[dmanlfc]

The dbus change cannot be added as is. It will affect all users. Also we don't use systemd.

[discretizer]

The dbus change cannot be added as is. It will affect all users. Also we don't use systemd.

DBus change is not needed anymore with the wpa_supplicant PR and nothing in this PR should affect or depend on systemd.

[dmanlfc]

The previous dbus change referenced systemd.
The patch may be ok, I will need to read it in more detail.
Where is the source of this patch? So I can read more about it.

[discretizer]

Moved the wpa_supplicant patch here in proper location per your comment on the buildroot PR (batocera-linux/buildroot#1054) and closed that PR. Patch originates from wpa_supplicant development thread here:
https://lists.infradead.org/pipermail/hostap/2025-May/043475.html

Reverted build root changes in branch.