Input: matrix_keypad - add missed header inclusion

The gpiod_count() API is defined in gpio/consumer.h. Include it.

Fixes: f8f7f47d ("Input: matrix_keypad - replace of_gpio_named_count() by gpiod_count()")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20220923184632.2157-1-andriy.shevchenko@linux.intel.com


Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>