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add touchscreen fw upgrade to default driver debugfs

this creates a debugfs interface the user can "echo" a firmware file into:

root@pureos:/home/purism# cd /sys/kernel/debug/edt_ft5x06/
root@pureos:/sys/kernel/debug/edt_ft5x06# echo /home/purism/FT8006P_Reference_C001_P001_V0x02_L0x07_20210107_all.bin > upgrade_bin
root@pureos:/sys/kernel/debug/edt_ft5x06# cat fw_version 

and removes the driver we had in tree for this. this should be done instead of !659 (closed) if that's ok.

Fixes: #383 (closed)

Edited by Martin Kepplinger

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