[rv_core_ibex] Add missing signals for RVFI
[rv_core_ibex] Add missing signals for RVFI

The RVFI gained new signals which were added in Ibex, but a previous
vendor-in forgot to adjust the port list.

Signed-off-by: Philipp Wagner <5a4b10454c30419e54a1570be358a516ff84bb63@lowrisc.org>

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