Change in coreboot[master]: soc/intel/common/cse: Add `cse_send_end_of_post()` a public function

[Subrata Banik (Code Review)]

Attention is currently required from: Tim Wawrzynczak, Angel Pons, Werner Zeh, Patrick Rudolph, EricR Lai.
Subrata Banik has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/61519 )

Change subject: soc/intel/common/cse: Add `cse_send_end_of_post()` a public function
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Patch Set 4:

(1 comment)

File src/soc/intel/common/block/cse/cse_eop.c:

https://review.coreboot.org/c/coreboot/+/61519/comment/f81c9fc6_cbab54e0 
PS4, Line 199: 
             : 	if (eop_sent) {
             : 		printk(BIOS_ERR, "EOP already sent\n");
             : 		return;
             : 	}
             :
> I suggested adding this as there was a TODO comment, and I thought this would be better than nothing. However, if there's something better, let's use it instead.

I have raised a bug b/217483219 to get feedback from Intel. Will share the progress.

From timing standpoint what we wish to do. Need suggestion:

1. Keep TODO and go ahead.
2. Have Static variable and go head
3. Wait for Intel (b/217483219) to share a possible path