The TQMx86 GPIO controller only supports falling and rising edge
triggers, but not both. Fix this by implementing a software both-edge
mode that toggles the edge type after every interrupt.

Fixes: b868db94 ("gpio: tqmx86: Add GPIO from for this IO controller")
Co-developed-by: Gregor Herburger <gregor.herburger@tq-group.com>
Signed-off-by: Gregor Herburger <gregor.herburger@tq-group.com>
Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
Link: https://lore.kernel.org/r/515324f0491c4d44f4ef49f170354aca002d81ef.1717063994.git.matthias.schiffer@ew.tq-group.comSigned-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>