Change in coreboot[master]: soc/intel/graphics: Create Kconfig for shifting graphic memory base

[Ethan Tsao (Code Review)]

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

Change subject: soc/intel/graphics: Create Kconfig for shifting graphic memory base
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Patch Set 14:

(3 comments)

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

https://review.coreboot.org/c/coreboot/+/61389/comment/fbe4112e_b296aafd 
PS11, Line 122: 	printk(BIOS_INFO, "gfx memory bar(0x18) = 0x%lx GFX_MEMBASE_OFFSET = 0x%x\n",
              : 		memory_base, CONFIG_SOC_INTEL_GFX_MEMBASE_OFFSET);
> > The purpose of this message is to print gfx basic information without adding debug message and re- […]

Done

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

https://review.coreboot.org/c/coreboot/+/61389/comment/065f3cc5_9c17c77a 
PS13, Line 129: 	printk(BIOS_INFO, "gfx memory base(after shift) = 0x%lx\n", memory_base);
> same as last comment, you don't need this.

Done

https://review.coreboot.org/c/coreboot/+/61389/comment/32bdb2a4_762fa2dd 
PS13, Line 129: after shift
> what is shift ?

just differentiate with real bar.