x86: Switch to use DM sysreset driver

This converts all x86 boards over to DM sysreset.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
diff --git a/arch/x86/dts/reset.dtsi b/arch/x86/dts/reset.dtsi
new file mode 100644
index 0000000..f979d83
--- /dev/null
+++ b/arch/x86/dts/reset.dtsi
@@ -0,0 +1,6 @@
+/ {
+	reset {
+		compatible = "x86,reset";
+		u-boot,dm-pre-reloc;
+	};
+};