riscv: hw: Change to use qemu_log_mask(LOG_GUEST_ERROR, ...) instead

riscv: hw: Change to use qemu_log_mask(LOG_GUEST_ERROR, ...) instead

Replace the call to hw_error() with qemu_log_mask(LOG_GUEST_ERROR,...)
in various sifive models.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>