platform/chrome: cros_ec_chardev: Add event relayer

Introduce an event relayer mechanism.  Instead of each open file
registering directly with `ec_dev->event_notifier`, the platform device
registers a single relayer notifier.  Individual files then register
with a local subscribers list in `chardev_pdata`.

This allows the driver to safely disconnect from the event chain
`ec_dev->event_notifier` during cros_ec_chardev_remove(), preventing
events from being delivered to open files after the device is removed,
while still allowing those files to be closed safely later.

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20260525052654.4076429-4-tzungbi@kernel.org
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>

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