iwinfo: detect QCA IPQ4019 WiSoC from FDT

iwinfo: detect QCA IPQ4019 WiSoC from FDT

As it's the most reliable and straight forward way on modern platforms,
detect the hardware ID by checking the 'compatible'-string of non-PCI
(ie. built-in) devices.
As this is only relevant for WiSoCs, there won't be that many records,
so it's not worth making any larger structural changes. Hence just
match the compatible string and translate it into fake PCI IDs.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>