net/e1000/base: add missing register defines
net/e1000/base: add missing register defines

Added defines for the EEC, SHADOWINF and FLFWUPDATE registers needed for
the nvmupd_validate_offset function to correctly validate the NVM update
offset.

Signed-off-by: Jeff Kirsher <87e35f5be20bb3e67f4ba6b86f5f6be3085b1b3a@intel.com>
Signed-off-by: Guinan Sun <2859c668e0b5b1e71d3c9d7ddf700c8e237b77a7@intel.com>
Reviewed-by: Wei Zhao <55941fd0e75edbdf274af2cfac8f147525678f08@intel.com>

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