Change in coreboot[master]: soc/intel/common Add support for CSE IOM/NPHY sub-parition update

[Krishna P Bhat D (Code Review)]

Attention is currently required from: Marx Wang, Tim Wawrzynczak, Rizwan Qureshi, Sridhar Siricilla, Balaji Manigandan, Nick Vaccaro, Patrick Rudolph.
Krishna P Bhat D has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/59685 )

Change subject: soc/intel/common Add support for CSE IOM/NPHY sub-parition update
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Patch Set 11:

(3 comments)

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

https://review.coreboot.org/c/coreboot/+/59685/comment/919bdfc7_a8c7b394 
PS11, Line 888: cbfs_locate_file_in_region
> should now be `cbfs_locate_file_in_region`

Looks like this API is getting deprecated. Need to identify another API to get access to cbfs file in the region_device.

https://review.coreboot.org/c/coreboot/+/59685/comment/745fc33b_24f35c88 
PS11, Line 958: 	/* Get sub-partition blob's version */
> Should these blobs have a hash stored in FW_MAIN_A/FW_MAIN_B/COREBOOT, just like the me_rw hash (and […]

These blobs are part of FW_MAIN_A/FW_MAIN_B/COREBOOT, they are verified by vboot.

https://review.coreboot.org/c/coreboot/+/59685/comment/269aad06_5fc6bb25 
PS11, Line 1035: void cse_fw_sync(void)
> Since the mainboard is the entity with the knowledge of whether or not an update is ultimately requi […]

cse_fw_sync() is being called from SoC romstage.c, but getting enabled from mainboard Kconfig.
In the current scenario, IOM/NPHY update is specific to SoC. 
`is_cse_sub_part_update_req` should be determined by SoC, while Kconfig to enable this feature comes from mainboard. Your thoughts?