[top/dv] Update RV_DM chip-level testplan
[top/dv] Update RV_DM chip-level testplan

Updated testplan as we discussed in the meeting
Signed-off-by: Weicai Yang <4fa8c7762ee4da95e3dee7dae2c3263ea16637f9@google.com>

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