[rtl] Break path from data_err_o -> instr_req_o
[rtl] Break path from data_err_o -> instr_req_o

Fixes #649

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