treewide: fix remaining uses of threading camel case methods

The threading camel case methods were deprecated in [1]. A previous
pyserial PR [2] fixed a bunch of these warnings, but missed a few.

Fix the remaining setName() DeprecationWarnings by using the
appropriate name attribute instead.

[1] https://github.com/python/cpython/pull/25174
[2] https://github.com/pyserial/pyserial/pull/643

Signed-off-by: Bastian Krause <bst@pengutronix.de>