hw/riscv: virt: Don't use a macro for the PLIC configuration

Using a macro for the PLIC configuration doesn't make the code any
easier to read. Instead it makes it harder to figure out what is going
on, so let's remove it.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20211022060133.3045020-1-alistair.francis@opensource.wdc.com

hw/riscv/virt.c

@@ -758,7 +758,7 @@ static char *plic_hart_config_string(int hart_count)
     int i;
 
     for (i = 0; i < hart_count; i++) {
-        vals[i] = VIRT_PLIC_HART_CONFIG;
+        vals[i] = "MS";
     }
     vals[i] = NULL;