rtc: cros-ec: Only warn once in .remove() about notifier_chain problems

When a remove platform device callback returns an error code, the driver
core emits an error message ("remove callback returned a non-zero value.
This will be ignored.\n") and still removes the device. As the driver
already emits a more specific error message, return 0 to suppress the
core's error message.

This is a preparation for making platform remove callbacks return void.

Signed-off-by: Uwe Kleine-König <[email protected]>
Acked-by: Tzung-Bi Shih <[email protected]>
Signed-off-by: Alexandre Belloni <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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