doc: update release notes for ice and iavf
doc: update release notes for ice and iavf

Update release notes by adding new features for ice and iavf PMD.

Fixes: de32fa2ba27b ("net/ice: support RSS for IPv6 prefix")
Fixes: 610bc231d09b ("net/ice: support RSS for IPv4 IPv6 mix of GTP")
Fixes: a9bafa9f700c ("net/ice: support flow director GTPU outer IPv4/IPv6")
Fixes: 37e444b77814 ("net/ice: support hash for GTPU protocols")
Fixes: 54851ff3375c ("net/ice: support PPPoE RSS")

Signed-off-by: Qi Zhang <9e9e58ffa71a29bb7b87766b362515be648fcbe0@intel.com>
Signed-off-by: Junfeng Guo <4e83c95a099a2e36f95a0baa7b159dfaca2b98e9@intel.com>
Signed-off-by: Jeff Guo <62aa901f8680899d1e8b3d9b45cf4843c2976e1c@intel.com>

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