i40e: fix DCB configuration with firmware >= 5.x
i40e: fix DCB configuration with firmware >= 5.x

When NVM version is updated to 5.x, DCB can not be configured. This
issue is because of the FW version validation is not correct.
This patch fixed this issue.

Fixes: c8b9a3e3fe1b (i40e: support DCB mode)

Signed-off-by: Jingjing Wu <64d28b617c3b4840f5ded1bfa611cba7fadfe5c7@intel.com>
Tested-by: Yulong Pei <8f7a0b15b0227bab24906e192d060fa2ad314844@intel.com>

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