hw/riscv: virt: fix syscon subnode paths

The reset and poweroff features of the syscon were originally added to
top level, which is a valid path for a syscon subnode. Subsequently a
reorganisation was carried out while implementing NUMA in which the
subnodes were moved into the /soc node. As /soc is a "simple-bus", this
path is invalid, and so dt-validate produces the following warnings:

/stuff/qemu/qemu.dtb: soc: poweroff: {'value': [[21845]], 'offset': [[0]], 'regmap': [[4]], 'compatible': ['syscon-poweroff']} should not be valid under {'type': 'object'}
        From schema: /home/conor/.local/lib/python3.9/site-packages/dtschema/schemas/simple-bus.yaml
/stuff/qemu/qemu.dtb: soc: reboot: {'value': [[30583]], 'offset': [[0]], 'regmap': [[4]], 'compatible': ['syscon-reboot']} should not be valid under {'type': 'object'}
        From schema: /home/conor/.local/lib/python3.9/site-packages/dtschema/schemas/simple-bus.yaml

Move the syscon subnodes back to the top level and silence the warnings.

Reported-by: Rob Herring <robh@kernel.org>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20220810184612.157317-4-mail@conchuod.ie
Link: https://lore.kernel.org/linux-riscv/20220803170552.GA2250266-robh@kernel.org/
Fixes: 18df0b4695 ("hw/riscv: virt: Allow creating multiple NUMA sockets")
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

hw/riscv/virt.c

@@ -897,7 +897,7 @@ static void create_fdt_reset(RISCVVirtState *s, const MemMapEntry *memmap,
     test_phandle = qemu_fdt_get_phandle(mc->fdt, name);
     g_free(name);
 
-    name = g_strdup_printf("/soc/reboot");
+    name = g_strdup_printf("/reboot");
     qemu_fdt_add_subnode(mc->fdt, name);
     qemu_fdt_setprop_string(mc->fdt, name, "compatible", "syscon-reboot");
     qemu_fdt_setprop_cell(mc->fdt, name, "regmap", test_phandle);
@@ -905,7 +905,7 @@ static void create_fdt_reset(RISCVVirtState *s, const MemMapEntry *memmap,
     qemu_fdt_setprop_cell(mc->fdt, name, "value", FINISHER_RESET);
     g_free(name);
 
-    name = g_strdup_printf("/soc/poweroff");
+    name = g_strdup_printf("/poweroff");
     qemu_fdt_add_subnode(mc->fdt, name);
     qemu_fdt_setprop_string(mc->fdt, name, "compatible", "syscon-poweroff");
     qemu_fdt_setprop_cell(mc->fdt, name, "regmap", test_phandle);