Revert "x86: add amd microcode entries to grub config"

This reverts commit a822283c7e.

Signed-off-by: John Crispin <john@phrozen.org>

target/linux/x86/base-files/lib/preinit/02_load_x86_ucode

@@ -0,0 +1,12 @@
+#!/bin/sh
+# Copyright (C) 2018 OpenWrt.org
+
+do_load_x86_ucode() {
+	if grep -q AuthenticAMD /proc/cpuinfo; then
+		if [ -e "/sys/devices/system/cpu/microcode/reload" ]; then
+			echo 1 > /sys/devices/system/cpu/microcode/reload
+		fi
+	fi
+}
+
+boot_hook_add preinit_main do_load_x86_ucode