gpio: sim: set a limit on the number of GPIOs

With the removal of ARCH_NR_GPIOS in commit 7b61212f

 ("gpiolib: Get
rid of ARCH_NR_GPIOS") the gpiolib core no longer sanitizes the number
of GPIOs for us. This causes the gpio-sim selftests to now fail when
setting the number of GPIOs to 99999 and expecting the probe() to fail.

Set a sane limit of 1024 on the number of simulated GPIOs and bail out
of probe if it's exceeded.

Reported-by: kernel test robot <oliver.sang@intel.com>
Link: https://lore.kernel.org/oe-lkp/202212112236.756f5db9-oliver.sang@intel.com
Fixes: 7b61212f

 ("gpiolib: Get rid of ARCH_NR_GPIOS")
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>