octeontx2-pf: Allow pkts of size morethan MTU to be transmitted

commit 5774b377da92f403f84e5ac16da8d8b414828792 from
git@git.assembla.com:cavium/WindRiver.linux.git

SMQ is already being configured to accept packets upto max HW supported
length. So changing packet length checks in xmit() to allow pkts of size
upto max HW supported instead of netdev->mtu

Change-Id: I985b145ba1ad0d22c7512e3261bbde6dddbd03da
Signed-off-by: Hariprasad Kelam <hkelam@marvell.com>
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/57835


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