octeontx2-af: Fix issue with IPv6 ext match for RSS

commit f7bc64afcf2a0b70b5081638102d8b8144e62efc from
git@git.assembla.com:cavium/WindRiver.linux.git

While performing RSS based on IPv6, extension ltype
is not being considered. This will be problem for
fragmented packets or packets with extension header.
Adding changes to match IPv6 ext header along with IPv6
ltype.

Signed-off-by: Kiran Kumar K <kirankumark@marvell.com>
Change-Id: I6a8091ee0cffdf662d8c591ed573d551806d79ae
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/93187


Tested-by: sa_ip-sw-jenkins <sa_ip-sw-jenkins@marvell.com>
Reviewed-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Signed-off-by: Wenlin Kang <wenlin.kang@windriver.com>