Change in coreboot[master]: soc/intel/graphics: Add override api for graphics_get_memory_base()

[Tim Wawrzynczak (Code Review)]

Attention is currently required from: Subrata Banik, Ethan Tsao, Ravishankar Sarawadi, Paul Menzel, Raj Astekar, Patrick Rudolph.
Tim Wawrzynczak has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/61389 )

Change subject: soc/intel/graphics: Add override api for graphics_get_memory_base()
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Patch Set 6:

(2 comments)

File src/soc/intel/common/Kconfig.common:

PS6: 
Should this go in`src/soc/intel/common/block/graphics/Kconfig` instead?

https://review.coreboot.org/c/coreboot/+/61389/comment/fd38e877_e6317aef 
PS6, Line 97:  "Enable override for Intel graphic_get_memory_base"
We don't want this option to be displayed by the user, it is not supposed to be user-selectable, just selected by the SoC Kconfig itself, so remove this.