PCI: rename octeontx2-pem-ep driver

commit 12d9187a23e0a5b417c797d83864450fa1a8b02c from
git@git.assembla.com:cavium/WindRiver.linux.git

Renamed octeontx2-pem-ep to marvell-cnxk-ep.

Signed-off-by: Radha Mohan Chintakuntla <radhac@marvell.com>
Change-Id: I1b999f8930d9162eb5fa5680441db728632ed9d4
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/91851


Reviewed-by: Devapraba Muthumani <dmuthumani@marvell.com>
Tested-by: Devapraba Muthumani <dmuthumani@marvell.com>
Signed-off-by: Wenlin Kang <wenlin.kang@windriver.com>