igb: Add BCM54616 initialization code for I354 mgmt on Netberg Aurora 420#76

sergeypopovich-ord wants to merge 2 commits intosonic-net:mastersonic-net/sonic-linux-kernel:masterfrom

OrdnanceNetworks:netberg-a420-supportOrdnanceNetworks/sonic-linux-kernel:netberg-a420-supportCopy head branch name to clipboard