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The existing qspi for stm32 implementation can only send a spi command with exactly 0 or 2 data bytes. Certain spiflash chips (e.g. AT25SF321B) have commands that only take a single data byte, and will ignore the command if more than that is sent. This commit allows sending a command with a single data byte. Signed-off-by: Victor Rajewski <victor@allumeenergy.com.au>