hw/net/cadence_gem: use FIELD to describe PHYMNTNC register fields Use the FIELD macro to describe the PHYMNTNC register fields. Signed-off-by: Luc Michel <luc.michel@amd.com> Reviewed-by: sai.pavan.boddu@amd.com Message-id: 20231017194422.4124691-10-luc.michel@amd.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>