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

target/linux/x86/image/grub-iso.cfg

@@ -7,12 +7,7 @@ set root='(cd)'
 
 menuentry "@TITLE@" {
 	linux /boot/vmlinuz @CMDLINE@ noinitrd
-	set amd="/boot/amd-ucode.img"
-	set intel="/boot/intel-ucode.img"
-	if [ -s "$amd" ]; then
-		initrd $amd $intel
-	fi
-	if [ -s "$intel" ]; then
-		initrd $intel $amd
+	if [ -s /boot/intel-ucode.img ]; then
+		initrd /boot/intel-ucode.img
 	fi
 }

target/linux/x86/image/grub.cfg

@@ -7,13 +7,8 @@ set root='(@ROOT@)'
 
 menuentry "@TITLE@" {
 	linux /boot/vmlinuz @CMDLINE@ noinitrd
-	set amd="/boot/amd-ucode.img"
-	set intel="/boot/intel-ucode.img"
-	if [ -s "$amd" ]; then
-		initrd $amd $intel
-	fi
-	if [ -s "$intel" ]; then
-		initrd $intel $amd
+	if [ -s /boot/intel-ucode.img ]; then
+		initrd /boot/intel-ucode.img
 	fi
 }
 menuentry "@TITLE@ (failsafe)" {