Change in coreboot[master]: treewide: Drop unused Kconfig symbols

[Arthur Heymans (Code Review)]

Attention is currently required from: Lance Zhao, Tim Wawrzynczak, Patrick Rudolph, Elyes Haouas, Felix Held.
Arthur Heymans has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/62362 )

Change subject: treewide: Drop unused Kconfig symbols
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Patch Set 7:

(1 comment)

File src/acpi/Kconfig:

https://review.coreboot.org/c/coreboot/+/62362/comment/21bef909_bf9c4632 
PS7, Line 38: config ACPI_EINJ
            : 	def_bool n
            : 	depends on HAVE_ACPI_TABLES
            : 	help
            : 	  This variable provides control for ACPI error injection table (EINJ)
Was recently added for RAS support. I think it's not yet hooked up but I would not remove this symbol yet.