kunit: Make filter parameters configurable via Kconfig

kunit: Make filter parameters configurable via Kconfig

Enable the preset of filter parameters from kconfig options, similar to
how other KUnit configuration parameters are handled already.
This is useful to run a subset of tests even if the cmdline is not
readily modifyable.

Link: https://lore.kernel.org/r/20251106-kunit-filter-kconfig-v1-1-d723fb7ac221@linutronix.de
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: David Gow <davidgow@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>