[S] Change in coreboot[master]: soc/intel/alderlake: Enable early caching of RAMTOP region

[Lean Sheng Tan (Code Review)]

Attention is currently required from: Tarun Tuli, Paul Menzel, Maximilian Brune.

Lean Sheng Tan has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/73736 )

Change subject: soc/intel/alderlake: Enable early caching of RAMTOP region
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Patch Set 6:

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/73736/comment/4cb736ed_a523e782 
PS1, Line 9: to optimize the boot time
> Please add hard numbers and the platform you tested with.

Sorry I dont have any data by hand, however did test on several boards and it works, will add that.

https://review.coreboot.org/c/coreboot/+/73736/comment/5f8ec910_c85c68a3 
PS1, Line 12: For further details, please refer to:
> Please summarize the details.

Done