Improve detection of Turris 1.x routers on TOS 6.0
With more recent kernels (5.4 in upcoming TOS 6.0), model name of Turris 1.x router changed to 'Turris 1.x' (defined in DTS).
Fix model detection code to detect Turris 1.x devices. Fix detection of wireless cards in pcie slots.
Closes: #18 (closed), #20 (closed)