[entropy_src/dv] New regression: "live"
[entropy_src/dv] New regression: "live"

For convenience this commit adds a new regression called "live" which
combines the entropy_src_rng and entropy_src_fw_ov tests, which
together make up much of the unit test coverage for entropy_src.

Signed-off-by: Martin Lueker-Boden <7e82c17fafb3b7b91b3c3396a2f21a060e5a6c3d@wdc.com>

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