* 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>