Fix a typo in the machine type being extracted from /proc/cpuinfo
which causes all Mikrotik board to be undetected properly.
This lead to sysupgrade issues and probably some others too.
Fixes: 
		
	
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| .. | ||
| imagebuilder | ||
| linux | ||
| sdk | ||
| toolchain | ||
| Config.in | ||
| Makefile | ||