bcmgenet: remove call to netdev_boot_setup_check

The driver has never used the netdev->{irq,base_addr,mem_start}
members, so this call is completely unnecessary.

Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>