[coreboot-gerrit] Change in coreboot[master]: riscv: Remove config string support

[build bot (Jenkins) (Code Review)]

build bot (Jenkins) has posted comments on this change. ( https://review.coreboot.org/22594 )

Change subject: riscv: Remove config string support
......................................................................

Patch Set 2: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/18648/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/63761/ : SUCCESS