x86: drop REBOOT_CF9_COND from reboot fallback chain

Impact: Reverts sequence of reboot fallbacks

Checkin 14d7ca5 changed the default
reboot method to "pci", a.k.a. port CF9.  Unfortunately this has been
shown to cause lockups on at least two systems for which REBOOT_KBD
worked, both Thinkpads with Intel chipsets.  Checkin
3889d0c reverted the default, but did
not revert the fallback chain.  This checkin reverts the fallback
chain; port CF9 is now only done by explicit "reboot=pci" or a future
potential DMI key.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

arch/x86/kernel/reboot.c

@@ -384,20 +384,20 @@ static void native_machine_emergency_restart(void)
 			load_idt(&no_idt);
 			__asm__ __volatile__("int3");
 
-			reboot_type = BOOT_CF9_COND;
+			reboot_type = BOOT_KBD;
 			break;
 
 #ifdef CONFIG_X86_32
 		case BOOT_BIOS:
 			machine_real_restart(jump_to_bios, sizeof(jump_to_bios));
 
-			reboot_type = BOOT_CF9_COND;
+			reboot_type = BOOT_KBD;
 			break;
 #endif
 
 		case BOOT_ACPI:
 			acpi_reboot();
-			reboot_type = BOOT_CF9_COND;
+			reboot_type = BOOT_KBD;
 			break;
 
 		case BOOT_EFI:
@@ -406,7 +406,7 @@ static void native_machine_emergency_restart(void)
 						 EFI_RESET_WARM :
 						 EFI_RESET_COLD,
 						 EFI_SUCCESS, 0, NULL);
-			reboot_type = BOOT_CF9_COND;
+			reboot_type = BOOT_KBD;
 			break;
 
 		case BOOT_CF9: