[STABLE 4.13] thunderbolt: fixes for key handling

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Upstream commits to be applied
==============================

8fdd6ab36197 thunderbolt: Remove superfluous check
0956e4116922 thunderbolt: Make key root-only accessible
e545f0d8a54a thunderbolt: Allow clearing the key


The reason why these should be applied
======================================

8fdd6ab36197 - the below patches depend on this one.

0956e4116922 is a security-related fix, it prevents non-root users from
reading the key.

e545f0d8a54a fixes functionality issue where if the key was rejected,
it's impossible to use "connect once" flow to connect without a key
even if the user chose to.


How to apply it
===============

Cherry-picking them to v4.13 passes cleanly.




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