Makefile: Implement the plateforms defined in cva6 specification
Created by: JeanRochCoulon
Implement the plateforms defined in cva6 specification target variable can take cv64a6_imacfd_sv39, cv32a6_imac_sv0, cv32a6_imac_sv32, cv32a6_imacf_sv32
NB: This modification will be used by core-v-verif repository to verify all 4 cva6 configurations
@sjthales
: the two targets cv32a6_imac_sv32 and cv32a6_imacf_sv32 have been added to prepare the "make FPGA 32bits". Today it is a recopy of cv32a6_imac_sv0 (there is no MMU yet). Feel free to define your configuration!