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spi: stm32-qspi: add automatic poll status feature
STM32 QSPI is able to automatically poll a specified register inside the memory and relieve the CPU from this task. As example, when erasing a large memory area, we got cpu load equal to 50%. This patch allows to perform the same operation with a cpu load around 2%. Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com> Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
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