[S] Change in coreboot[main]: soc/intel/cmn/gfx: Add API to report presence of external display

[Julius Werner (Code Review)]

Attention is currently required from: Arthur Heymans, Kapil Porwal, Lean Sheng Tan, Nick Vaccaro, Subrata Banik, Werner Zeh.

Julius Werner has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/78080?usp=email )

Change subject: soc/intel/cmn/gfx: Add API to report presence of external display
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Patch Set 1:

(1 comment)

File src/soc/intel/common/block/graphics/graphics.c:

https://review.coreboot.org/c/coreboot/+/78080/comment/7cd533a9_154fdf14 :
PS1, Line 59: #if CONFIG(REPORT_EXTERNAL_DISPLAY_AT_PREBOOT)
Are there really platforms using this file for which this code doesn't work? Otherwise you should probably `select` this option from CONFIG_SOC_INTEL_COMMON_BLOCK_GRAPHICS and then assume it is set here.