[coreboot-gerrit] Change in coreboot[master]: mb/clevo/kbl-u: Add Clevo N240BU as variant

[Paul Menzel (Code Review)]

Paul Menzel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/43760 )

Change subject: mb/clevo/kbl-u: Add Clevo N240BU as variant
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Patch Set 11:

Linux currently reports the errors below:

```
$ sudo dmesg --level=err
[    0.366302] ACPI BIOS Error (bug): Could not resolve symbol [_SB.PCI0.GFX0], AE_NOT_FOUND (20190816/dswload2-159)
[    0.366374] ACPI Error: AE_NOT_FOUND, During name lookup/catalog (20190816/psobject-220)
[    4.916463] irq 11: nobody cared (try booting with the "irqpoll" option)
[    4.916537] handlers:
[    4.916554] [<000000000553a82c>] i801_isr [i2c_i801]
```