Revert "Revert "driver core: Set fw_devlink to "permissive" behavior by default""

This reverts commit 18555cb6.

The reason[1] for the original revert has now been fixed by
commit 00b24755

 ("driver core: Fix handling of
fw_devlink=permissive"). So, this patch reverts the revert. Marek has
also tested this patch with the fix mentioned above and confirmed that
the issue has been fixed.

[1] - https://lore.kernel.org/lkml/CAGETcx8nbz-J1gLvoEKE_HgCcVGyV2o8rZeq_USFKM6=s7WmNg@mail.gmail.com/T/#m12dfb5dfd23805b84c49f4bb2238a8cce436c2f7
[2] - https://lore.kernel.org/lkml/CAGETcx8nbz-J1gLvoEKE_HgCcVGyV2o8rZeq_USFKM6=s7WmNg@mail.gmail.com/T/#m2408a6ce098b2ebf583ca8534329695923ae57fe
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20200428192006.109006-1-saravanak@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>