Change in coreboot[master]: drivers/intel/gma: add macro for one internal panel in gfx struct

[Nico Huber (Code Review)]

Nico Huber has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/49054 )

Change subject: drivers/intel/gma: add macro for one internal panel in gfx struct
......................................................................

Patch Set 2:

(1 comment)

https://review.coreboot.org/c/coreboot/+/49054/1/src/drivers/intel/gma/gma.h 
File src/drivers/intel/gma/gma.h:

https://review.coreboot.org/c/coreboot/+/49054/1/src/drivers/intel/gma/gma.h... 
PS1, Line 33:  at port A
> PRM (Doc Ref # IHD-OS-KBL-Vol 12-1.17) / intel-gfx-prm-osrc-kbl-vol12-display.pdf : Page 108 has a table with "DDI Equivalent Names":
>
> DDI A: Port 0, DDI-A, DDIA, Port A, DDI0, eDP
> DDI B: Port 1, DDI-B, DDIB, Port B, DDI1
> ...

In other words, it doesn't mention ACPI?

At least i915 doesn't seem to use the field at all, cf.
`ACPI_DISPLAY_PORT_ATTACHMENT_SHIFT` etc. in
`display/intel_acpi.c`.