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Implement stm32_rng_suspend()/stm32_rng_resume() low-power APIs called when the hardware block context will be lost. There is no need to save the RNG_CR register in stm32_rng_runtime_suspend() as the context is not lost. Therefore, only enable/disable the RNG in the runtime sequences. Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>