[S] Change in coreboot[master]: soc/intel/cmn/block/cse: Support sending EOP from payload

[Paul Menzel (Code Review)]

Attention is currently required from: Kapil Porwal, Himanshu Sahdev.

Paul Menzel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/74765 )

Change subject: soc/intel/cmn/block/cse: Support sending EOP from payload
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Patch Set 4:

(5 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/74765/comment/15439d07_6e0aa61d 
PS4, Line 9: might require more time
           : to process the EOP command
Please document your measured numbers.

https://review.coreboot.org/c/coreboot/+/74765/comment/420d2ada_53b7c22b 
PS4, Line 10: Currently any boot time improvement in
            : coreboot leads to increase in EOP processing time
I do not fully understand this. The EOP processing is happening in parallel and should be constant?

https://review.coreboot.org/c/coreboot/+/74765/comment/7eeeba93_6abdbab9 
PS4, Line 14: This improves boot time by ~10ms milliseconds.
Can the CSE firmware be updated to boot faster?

https://review.coreboot.org/c/coreboot/+/74765/comment/518478df_432bf1c1 
PS4, Line 17: TEST=Verify sending EOP from depthcharge
On what devices?

File src/soc/intel/common/block/cse/Kconfig:

https://review.coreboot.org/c/coreboot/+/74765/comment/450ab5b4_c2b07734 
PS4, Line 119: 	  It has been observed that CSE might be busy and might require more time to
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