gpio: brcmstb: allow parent_irq to wake

gpio: brcmstb: allow parent_irq to wake

The classic parent_wake_irq can only occur after the system has
been placed into a hardware managed power management state. This
prevents its use for waking from software managed suspend states
like s2idle.

By allowing the parent_irq to be enabled for wake enabled GPIO
during suspend, these GPIO can now be used to wake from these
states. The 'suspended' boolean is introduced to support wake
event accounting.

Signed-off-by: Doug Berger <opendmb@gmail.com>
[florian: port changes after generic gpio chip conversion]
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Linus Walleij <linusw@kernel.org>
Link: https://patch.msgid.link/20260204164333.1146039-4-florian.fainelli@broadcom.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>