The build failed because the CONFIG_FSL_DPAA2_ETH_DCB option was not
set. Activate this option to build the driver with DCB support when it
is available.
Fixes: 40f1db9cb1 ("kernel: Add KERNEL_DCB (Data Center Bridging)")
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>