Change in coreboot[master]: mb/google/dedede/var/magolor: Set core display clock to 172.8 MHz

[Ren Kuo (Code Review)]

Attention is currently required from: Henry Sun, Ren Kuo, Simon Yang, Kane Chen, Karthik Ramasubramanian.
Hello build bot (Jenkins), Henry Sun, Simon Yang, Kane Chen, Karthik Ramasubramanian,

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

https://review.coreboot.org/c/coreboot/+/60301

to look at the new patch set (#6).

Change subject: mb/google/dedede/var/magolor: Set core display clock to 172.8 MHz
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mb/google/dedede/var/magolor: Set core display clock to 172.8 MHz

With the default core display clock of 172.8 MHz,it improved the
stability of start up in Chrome OS in secure mode.
The rare fail system will not hang up in Chrome OS from secure mode.
The core display clock =  172.8 MHz in coreboot is form Intel's
recommendation. (refer to src/soc/intel/jasperlake/chip.h)

BUG=b:206557434
BRANCH=dedede
TEST=Build firmware and verify on fail DUTs.
     Check the DUTs can boot up in secure mode.

Change-Id: I5a0ad2bed79b37775184f0bd0a0ef024900cbe34
Signed-off-by: Ren Kuo 
---
M src/mainboard/google/dedede/variants/magolor/overridetree.cb
1 file changed, 3 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/01/60301/6