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: Chuhong Yuan <hslester96@gmail.com> Acked-by: Łukasz Stelmach <l.stelmach@samsung.com> Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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