[coreboot] [RFC] Replace strapping entries in coreboot table

[Tim Wawrzynczak]

Hi coreboot community,

Currently there are 3 different "strapping" entries in the coreboot tables,
and with the recent addition of fw_config (
https://review.coreboot.org/c/coreboot/+/41209), we would also like to add
the 64-bit fw_config field (updated here
https://review.coreboot.org/c/coreboot/+/45939) to the coreboot table as
well.

In this patch (https://review.coreboot.org/c/coreboot/+/46605), I am
proposing to deprecate the 3 current "strapping" entries (board ID, ram
code and SKU ID), and add them all to 1 entry, containing board ID, ram
code, SKU ID as well as fw_config. This saves the overhead of parsing 4
different entries to obtain board configuration information.

Would like to hear any thoughts on this,
 - Tim