[S] Change in coreboot[main]: drivers/intel/dptf: Add DCFG method support

[Sumeet R Pawnikar (Code Review)]

Attention is currently required from: Eric Lai, Kapil Porwal, Paul Menzel, Subrata Banik.

Sumeet R Pawnikar has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/78386?usp=email )

Change subject: drivers/intel/dptf: Add DCFG method support
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Patch Set 5:

(1 comment)

File src/drivers/intel/dptf/dptf.c:

https://review.coreboot.org/c/coreboot/+/78386/comment/b69539c2_55841691 :
PS4, Line 164: 	acpigen_write_name("DCFE");
> How to change the DCFE is it is hard code? Should pass by config?

ODM/OEM can configure this by adding dcfg config under overridetree.cb file for specific product. 
Submitted TEST patch https://review.coreboot.org/c/coreboot/+/81345 on usage of this.