riscv: sifive_u: Update model and compatible strings in device tree

This updates model and compatible strings to use the same strings
as used in the Linux kernel device tree (hifive-unleashed-a00.dts).

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>

hw/riscv/sifive_u.c

@@ -96,8 +96,9 @@ static void create_fdt(SiFiveUState *s, const struct MemmapEntry *memmap,
         exit(1);
     }
 
-    qemu_fdt_setprop_string(fdt, "/", "model", "ucbbar,spike-bare,qemu");
-    qemu_fdt_setprop_string(fdt, "/", "compatible", "ucbbar,spike-bare-dev");
+    qemu_fdt_setprop_string(fdt, "/", "model", "SiFive HiFive Unleashed A00");
+    qemu_fdt_setprop_string(fdt, "/", "compatible",
+                            "sifive,hifive-unleashed-a00");
     qemu_fdt_setprop_cell(fdt, "/", "#size-cells", 0x2);
     qemu_fdt_setprop_cell(fdt, "/", "#address-cells", 0x2);