[spi_device/dv] Add TPM + flash/passthrough in testplan
[spi_device/dv] Add TPM + flash/passthrough in testplan

Add a test entry and a covergroup for it

Signed-off-by: Weicai Yang <4fa8c7762ee4da95e3dee7dae2c3263ea16637f9@google.com>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan