[M] Change in coreboot[main]: google/*: Clean up Kconfig board selection for non-MTK Google Arm boards

[Julius Werner (Code Review)]

Attention is currently required from: Felix Singer, Julius Werner, Nico Huber, Shelley Chen.

Hello Felix Singer, Nico Huber, Shelley Chen, Yu-Ping Wu, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/79022?usp=email

to look at the new patch set (#3).

The following approvals got outdated and were removed:
Verified+1 by build bot (Jenkins)

Change subject: google/*: Clean up Kconfig board selection for non-MTK Google Arm boards
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google/*: Clean up Kconfig board selection for non-MTK Google Arm boards

This patch unifies and simplifies the Kconfig selection model for the
Gru, Herobrine, Trogdor and Veyron boards according to the model
discussed in CB:78972.

Also add missing license headers to two Kconfig files while I'm here.

Change-Id: If679a05afd10869afba9c2a33b54862e102b5f40
Signed-off-by: Julius Werner 
---
M src/mainboard/google/gru/Kconfig
M src/mainboard/google/herobrine/Kconfig
M src/mainboard/google/trogdor/Kconfig
M src/mainboard/google/veyron/Kconfig
4 files changed, 59 insertions(+), 139 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/22/79022/3