Revert "driver core: Set fw_devlink=on by default"

This reverts commit e5904747.

While things are _almost_ there and working for almost all systems,
there are still reported regressions happening, so let's revert this
default for 5.12.  We can bring it back in linux-next after 5.12-rc1 is
out to get more testing and hopefully solve the remaining different
subsystem and driver issues that people are running into.

Cc: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20210219074549.1506936-1-gregkh@linuxfoundation.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>