fix: command sequence for flash spi with dma #370
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Description
According to the WBA manual, the SPI_CR1_CSTART has to be set after the SPI_CR1_SPE to enable the SPI with DMA since the first starts the master transfer while the second enables the peripheral.
In other words, it was starting the transmission with the peripheral disabled.
The solution consists in reorder them.
OBS:
The SPI_CR1_CSTART is a command for WBA family only (until now).