Feature/fix linux bbl

Created by: JeanRochCoulon

cva6.yaml: Fix Linux BBL PASS/FAIL strategy

Today, Linux BBL is built out line to produce bbl.o The test consists in executing the first 40M cycles of bbl.o The grep command checks that PC passes on "relocate" (vmlinux symbol) Of course, the address depends on thr bbl.o, to be added to the TODO list !