ipq40xx:Add support for Netgear LBR20 with two BDF's

ipq40xx:Add support for Netgear LBR20 with two BDF's

Files QCA4019 hw1.0 and QCA9888 hw2.0 been exracted from Netgear's LBR20 firmware , and treated with qca-swiss-army-knife:
For QCA4019 hw1.0
bus=ahb,bmi-chip-id=0,bmi-board-id=20,variant=Netgear-LBR20
bus=ahb,bmi-chip-id=0,bmi-board-id=21,variant=Netgear-LBR20
and created a file:
board-netgear_lbr20.qca4019

For QCA9888 hw2.0
bus=pci,bmi-chip-id=0,bmi-board-id=17,variant=Netgear-LBR20
and created a file:
board-netgear_lbr20.qca9888

LBR20 have 3 radios:
radio0 : in qca9888 5Ghz low channels
radio1: in ipq4019 2,4Ghz
radio2: in ipq 4019 5Ghz high channels

Signed-off-by: Marcin Gajda <mgajda@o2.pl>