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H A Dstm32_rng.c3e64c635856ea5a1aba1293429a440809d97edb2 Wed Jan 18 17:28:35 UTC 2023 Gatien Chevallier <gatien.chevallier@foss.st.com> drivers: stm32_rng: implement late seed error detection

As per STM32MP1x specification, rare seed error conditions must be
considered when random value read from DR register is zero.

Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>