Update opentitan-peripheral robot to match the spi_device implementation

Renode code base enabled spi_device at
https://github.com/renode/renode/commit/44fa51ea4f2ecd5c6a5e71124eebc35a5727f085

Update our robot script to match the change

Change-Id: I4f76fafb796bce9ee36b9b326d6afd5b4667d850
1 file changed