hwrng: drivers - Use device-managed registration API
Use devm_hwrng_register to simplify the implementation. Manual unregistration and some remove functions can be removed now. Signed-off-by: NChuhong Yuan <hslester96@gmail.com> Acked-by: NŁukasz Stelmach <l.stelmach@samsung.com> Acked-by: NLudovic Desroches <ludovic.desroches@microchip.com> Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
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