FROMGIT: PCI: mediatek-gen3: Enable async probe by default

The mediatek-gen3 driver can run its probe routine fairly slow on some
hardware, which adds to the total time it takes for the system start up.

Thus, turn on async mode for the probe to avoid blocking the rest of the
system.

Link: https://lore.kernel.org/r/20241220145205.1.Ibf2563896c3b1fc133bb46d3fc96ad0041763922@changeid


Signed-off-by: Douglas Anderson <dianders@chromium.org>
[kwilczynski: commit log]
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
(cherry picked from commit 17bd5e4d
 git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git controller/mediatek)

BUG=b:385391238
TEST=WiFi still works

Change-Id: Ibf2563896c3b1fc133bb46d3fc96ad0041763922
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/6168655


Reviewed-by: Sean Paul <sean@poorly.run>
Tested-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Commit-Queue: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Hubert Mazur <hmazur@google.com>