drivers: gpio: gpio_pca953x: Adding input latch and interrupt mask

The gpio_pca953x gpio driver doesn't have
the input latch and interrupt mask
configuration which causes a lack of accessing
and using those features on an gpio expander
device. Fix it by adding input latch and
interrupt mask configurations in this driver.

Signed-off-by: Vudang Thaihai <vudang.thaihai@brillpower.com>