kunit: qemu_configs: Disable faulting tests on 32-bit SPARC

The 32-bit sparc configuration (--arch sparc) crashes on
the kunit_fault_test. It's known that some architectures don't handle
deliberate segfaults in kernel mode well, so there's a config switch to
disable tests which rely upon it by default.

Use this for the sparc config, making sure the default config for it
passes.

Link: https://lore.kernel.org/r/20250416093826.1550040-1-davidgow@google.com


Fixes: 87c9c163 ("kunit: tool: add support for QEMU")
Signed-off-by: David Gow <davidgow@google.com>
Reviewed-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Tested-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>