selftests: gpio: Add gpio-cdev-uaf tests

Add tests for gpiolib-cdev to make sure accessing to dangling resources
via the opening file descriptor won't crash the system after the
underlying resource

selftests: gpio: Add gpio-cdev-uaf tests

Add tests for gpiolib-cdev to make sure accessing to dangling resources
via the opening file descriptor won't crash the system after the
underlying resource providers have gone.

Reviewed-by: Linus Walleij <linusw@kernel.org>
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://patch.msgid.link/20260223061726.82161-7-tzungbi@kernel.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>

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