mfd: tqmx86: Make IRQ setup errors non-fatal

mfd: tqmx86: Make IRQ setup errors non-fatal

GPIO IRQ setup can fail either because an invalid IRQ was passed as a
parameter, or because the GPIO controller does not support interrupts.
Neither is severe enough to stop the whole probe; simply disable IRQ
support in the GPIO resource when setup fails.

The code is made a bit more robust by introduing an enum for the
resource list indices instead of assuming that the IRQ is at index 0.

Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
Link: https://lore.kernel.org/r/2b5522362098d54c6203be6da95bbc545a21fd49.1731325758.git.matthias.schiffer@ew.tq-group.com
Signed-off-by: Lee Jones <lee@kernel.org>