spi: stm32_qspi: add clk_get_rate() support
Replace proprietary clock_get() by clk_get_rate() The stm32_qspi is now "generic" and can be used by other STM32 SoCs. Signed-off-by: NPatrice Chotard <patrice.chotard@st.com> Acked-by: NVikas MANOCHA <vikas.manocha@st.com>
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