Change simple system core file to provide default files
Change simple system core file to provide default files

To allow other modules to reference the simple system, it must provide
default files. In particular this is useful in DV settings where bind
is used.

Signed-off-by: Stefan Wallentowitz <aa79485f13b22bab37681d0f18a734c0d9e3487c@hm.edu>

AmbiML/ibex,lowRISC/ibex,AmbiML/ibex,lowRISC/ibex,lowRISC/ibex,AmbiML/ibex,AmbiML/ibex,lowRISC/ibex