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* add soft-spi * add spi-bit-ops.c/h to components/drivers/spi * add a drv_soft_spi example for gd32303e-eval Signed-off-by: kyle <kylepengchn@163.com> * Fixed the format and the certificate. Signed-off-by: kyle <kylepengchn@163.com> * Update the certificate data. Signed-off-by: kyle <kylepengchn@163.com>