doc: announce removal of octeontx2 drivers
doc: announce removal of octeontx2 drivers

In the view of enabling unified driver for octeontx2(cn9k)/
octeontx3(cn10k), removing drivers/octeontx2 drivers and
replace with drivers/cnxk/ which supports both octeontx2(cn9k)
and octeontx3(cn10k) SoCs.

Signed-off-by: Jerin Jacob <352c4d4f9291b869992ddb67daa45ddc149fed30@marvell.com>
Acked-by: Ferruh Yigit <ba8734c3c506d2e3557bd4ac8fdaccd25bdb9aa7@intel.com>
Acked-by: Akhil Goyal <c3c9da6f7a1dc963875aa67cfd85a4c94f75d526@marvell.com>
Acked-by: Thomas Monjalon <5f50a84c1fa3bcff146405017f36aec1a10a9e38@monjalon.net>
Acked-by: David Marchand <f28529695cfa9e3e1eb84e7072aa626af4abb18e@redhat.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk