[S] Change in coreboot[main]: inteltool/gpio_names/*.h: Add GPL-2.0-only SPDX license header

[Nicholas Chin (Code Review)]

Attention is currently required from: Alexander Couzens, Felix Singer, Martin L Roth, Pratikkumar V Prajapati, Stefan Reinauer.

Nicholas Chin has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/78628?usp=email )

Change subject: inteltool/gpio_names/*.h: Add GPL-2.0-only SPDX license header
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Patch Set 4:

(3 comments)

File util/inteltool/gpio_names/icelake.h:

https://review.coreboot.org/c/coreboot/+/78628/comment/88cd8c3b_30689e10 :
PS3, Line 1: /* inteltool - dump all registers on an Intel CPU + chipset based system */
> here as well

Done

File util/inteltool/gpio_names/lewisburg.h:

https://review.coreboot.org/c/coreboot/+/78628/comment/5a9abd15_e2f5ee3a :
PS3, Line 1: /* inteltool - dump all registers on an Intel CPU + chipset based system */
> here as well

Done

File util/inteltool/gpio_names/sunrise.h:

https://review.coreboot.org/c/coreboot/+/78628/comment/400c50b1_27dabae6 :
PS3, Line 1: /* inteltool - dump all registers on an Intel CPU + chipset based system */
> missed that

Seems like `vim -p *.h` hit a tab limit when I removed those from the other files. I also seemed to have missed adding a header to a few files for the same reason. Fixed.