gpio: pca953x: mask interrupts in irq shutdown

gpio: pca953x: mask interrupts in irq shutdown

In the existing implementation irq_shutdown does not mask the interrupts
in hardware. This can cause spurious interrupts from the IO expander.
Add masking to irq_shutdown to prevent spurious interrupts.

Cc: stable@vger.kernel.org
Signed-off-by: Martin Larsson <martin.larsson@actia.se>
Reviewed-by: Linus Walleij <linusw@kernel.org>
Link: https://lore.kernel.org/r/20260121125631.2758346-1-martin.larsson@actia.se
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>