Change in coreboot[master]: soc/intel/common: Configure TCSS access through IOE P2SB

[John Zhao (Code Review)]

Attention is currently required from: Eric Lai, Angel Pons, Patrick Rudolph, EricR Lai.
John Zhao has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/62723 )

Change subject: soc/intel/common: Configure TCSS access through IOE P2SB
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Patch Set 2:

(1 comment)

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

https://review.coreboot.org/c/coreboot/+/62723/comment/9fbe99e4_7078001d 
PS2, Line 389: 	else if (CONFIG(SOC_INTEL_COMMON_BLOCK_TCSS_REG_ACCESS_SBI)) {
> Is just SOC_INTEL_COMMON_BLOCK_IOE_P2SB sufficient enough?

Under the scope of SOC_INTEL_COMMON_BLOCK_REG_ACCESS_SBI, there is consideration for future platforms expansion beyond the Meteor Lake which has the IOE die. i.e, 
else if (CONFIG(SOC_INTEL_COMMON_BLOCK_REG_ACCESS_SBI)) { 
    if (CONFIG(SOC_INTEL_COMMON_BLOCK_IOE_P2SB)) 
        ioe_tcss_configure_aux_bias_pads_sbi(pads);  // MTL with IOE
    // TBD
    else if (CONFIG(SOC_INTEL_COMMON_BLOCK_XYZ_P2SB)) 
        xyz_tcss_configure_aux_bias_pads_sbi(pads);  // XYZ platform
}