hwrng: stm32 - rework read timeout calculation
Increase timeout delay to support longer timing linked to rng initialization. Measurement is based on timer instead of instructions per iteration which is not powerful on all targets. Signed-off-by: NLionel Debieve <lionel.debieve@st.com> Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
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