char: tpm: Use SIMPLE_DEV_PM_OPS for ibmvtpm power management

Replace the manually defined dev_pm_ops structure with the
SIMPLE_DEV_PM_OPS macro to simplify the power management code.
This macro automatically handles CONFIG_PM_SLEEP configuration,
generating the same suspend/resume callbacks while reducing
boilerplate code.Add the value of 'thaw,freeze,poweroff,restore'.

Signed-off-by: Li Jun <lijun01@kylinos.cn>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Link: https://lore.kernel.org/r/20260819083547.2703228-1-lijun01@kylinos.cn
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>

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