mei: vsc: Unset the event callback on remove and probe errors

Make mei_vsc_remove() properly unset the callback to avoid a dead callback
sticking around after probe errors or unbinding of the platform driver.

Fixes: 386a766c ("mei: Add MEI hardware support for IVSC device")
Signed-off-by: Hans de Goede <hansg@kernel.org>
Link: https://lore.kernel.org/r/20250623085052.12347-8-hansg@kernel.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>