forked from Mirrors/opensbi

Remove unnecessary CSR_MTVEC read to reduce the openSBI CSR requirement. Mux are costly in FPGA. Allowing CSR_MTVEC to be write only is usefull for the FMax/Area of FPGA softcore. https://github.com/SpinalHDL/opensbi.git branch mtvec Signed-off-by: Charles Papon <charles.papon.90@gmail.com> Reviewed-by: Atish Patra <atish.patra@wdc.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>