spi: stm32-qspi: Fix wait_cmd timeout in APM mode

Solves issue https://git.kontron-electronics.de/sw/yocto/build-stm32mp/-/issues/76

Replaces MR !25 (closed) with ST's planned upstream version

Signed-off-by: Patrice Chotard patrice.chotard@foss.st.com