Bug#986949: Linux 4.19 staging driver mt7621-mmc has problematic license

[Gernot Hillier]

Oops, sorry, the path of the example in initial bug description is 
incomplete - the cited problematic licensing terms are from 
drivers/staging/mt7621-mmc/sd.c.

However, please refer to kernel commit 441bf7332 linked in the initial 
bug description for a list of files that should be removed.