gpio: brcmstb: implement .irq_mask_ack()

gpio: brcmstb: implement .irq_mask_ack()

The .irq_mask_ack() operation is slightly more efficient than doing
.irq_mask() and .irq_ack() separately.

More importantly for this driver it bypasses the check of
irqd_irq_masked ensuring a previously masked but still active
interrupt gets remasked if unmasked at the hardware level. This
allows the driver to more efficiently unmask the wake capable
interrupts when quiescing without needing to enable the irqs
individually to clear the irqd_irq_masked state.

Reviewed-by: Linus Walleij <linusw@kernel.org>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Doug Berger <opendmb@gmail.com>
Co-developed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://patch.msgid.link/20260204164333.1146039-3-florian.fainelli@broadcom.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>