[M] Change in coreboot[main]: intel/alderlake: Add helper functions for Power Management

[Angel Pons (Code Review)]

Attention is currently required from: Dinesh Gehlot, Eric Lai, Kapil Porwal, Matt DeVillier, Nick Vaccaro, Nico Huber, Paul Menzel, Sean Rhodes, Subrata Banik.

Angel Pons has posted comments on this change by Sean Rhodes. ( https://review.coreboot.org/c/coreboot/+/81638?usp=email )

Change subject: intel/alderlake: Add helper functions for Power Management
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Patch Set 16: Code-Review+1

(1 comment)

File src/soc/intel/alderlake/fsp_params.c:

https://review.coreboot.org/c/coreboot/+/81638/comment/6d5625dc_3eb97469?usp... :
PS15, Line 507: if (rp_cfg->pcie_rp_aspm == 0)
              : 		s_cfg->PcieRpAspm[index] = 4;
              : 	else
              : 		s_cfg->PcieRpAspm[index] = rp_cfg->pcie_rp_aspm - 1;
> I don't hate it, it's certainly much more readable. […]

I added the prefix because there's functions elsewhere (common code?) with the same name.