net/tls: Fix return values to avoid ENOTSUPP

commit 4a5cdc60 upstream.

ENOTSUPP is not available in userspace, for example:

  setsockopt failed, 524, Unknown error 524

Signed-off-by: Valentin Vidic <vvidic@valentin-vidic.from.hr>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[PG: drop tools/selftest part; doesn't use ENOTSUPP in v5.2.x]
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>