board/minnowboard: add CONFIG_IGB in Linux kernel config
The 2017 MinnowBoard Turbot skews no longer use the Realtek 8169
Ethernet chip. The Turbot D0 uses The Intel I211, the Turbot Dual
Ethernet has an I210 (quad-core) or I211 (dual-core).
Add CONFIG_IGB to the Linux config but keep the Realtek 8169 support
to avoid breaking older boards
Tested on Turbot D0, lspci -k shows the igb driver is used:
03:00.0 Class 0200: 8086:1539 igb
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>