Octeontx2-af: Fix linking issue

commit c4391c8dfe0bc88bba387d072f8f47588d74cf2f from
git@git.assembla.com:cavium/WindRiver.linux.git

Export otx2_txschq_free_one() to be referenced from pf/vf drivers

Signed-off-by: Suman Ghosh <sumang@marvell.com>
Change-Id: Ia44163ceac36b5425c24e77ce42f9ec5817f593c
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/99561


Tested-by: sa_ip-sw-jenkins <sa_ip-sw-jenkins@marvell.com>
Tested-by: Devapraba Muthumani <dmuthumani@marvell.com>
Reviewed-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Signed-off-by: Ruiqiang Hao <Ruiqiang.Hao@windriver.com>