i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI

Keep the PCI wakeup state aligned with the wakeup requirements of the
devices served by the controller(s).

The PCI function is the wakeup source for HCI instances exposed beneath
it.  However, wakeup is only needed when at least one attached I3C device
is enabled as a wakeup source.

During suspend, check whether any HCI instance has a wakeup-enabled I3C
device and enable wakeup for the PCI function only in that case.
Otherwise leave PCI wakeup disabled.

Note, the suspend callback is used for both system and runtime suspend.
Although this change may update the PCI wakeup state during runtime
suspend, it does so only when the required wakeup state changes.
Moreover, PCI wakeup-capable devices already have PME wakeup armed for
runtime suspend, so changing the wakeup-enabled state does not affect
runtime PM wakeup behavior.

Note also, since the PCI wakeup state is derived from the wakeup
configuration of the attached I3C devices, the PCI device power/wakeup
sysfs attribute no longer provides independent wakeup control.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260807145638.168865-13-adrian.hunter@intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

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