spi: stm32-qspi: Always wait BUSY bit to be cleared in stm32_qspi_wait_cmd()

[Mark Brown]

On Thu, Jun 03, 2021 at 09:34:21AM +0200, patrice.chotard at foss.st.com wrote:
> From: Patrice Chotard <patrice.chotard at foss.st.com>
> 
> In U-boot side, an issue has been encountered when QSPI source clock is
> running at low frequency (24 MHz for example), waiting for TCF bit to be
> set didn't ensure that all data has been send out the FIFO, we should also
> wait that BUSY bit is cleared.

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