Bug#918331: linux-image-4.19.0-1-686-pae-unsigned: Compile mt76x0 module to support some wireless adapters

[James]

Some more information regarding the mt76 driver added in kernel 4.19.* 
(affects testing and unstable):

https://wireless.wiki.kernel.org/en/users/Drivers/mediatek
I have been having the same issue as OP. Those on #debian-next clarified 
that mt76 is indeed part of the kernel, but simply needs to be enabled 
by the maintainers via the config file.