Change in coreboot[master]: payloads/external: Add support for coreDOOM payload

[Nicholas Chin (Code Review)]

Attention is currently required from: Martin L Roth, Paul Menzel, Stefan Reinauer.
Nicholas Chin has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/57222 )

Change subject: payloads/external: Add support for coreDOOM payload
......................................................................

Patch Set 5:

(3 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/57222/comment/5a92252b_ae46da39 
PS4, Line 9: coreDOOM is a port of the doomgeneric source port of DOOM to libpayload, drawing
> Please wrap lines after 72 characters.

Done

Patchset:

PS5: 
Rebased, removed unused options for libpayload config, and tweaked help text wordings.

File payloads/Kconfig:

https://review.coreboot.org/c/coreboot/+/57222/comment/4985e888_10c332e0 
PS4, Line 154: 	  or any other payload that can load additional payloads.
> … It needs the generic linear framebuffer.

Done