mb/google/guybrush/var/nipperkin: Add Board values for eDP tuning

Reference test document, update tuning registers from pass experiment
setting of phy_settings.
The document about eDP tuning can be gotten from the issue tracker of
this ticket, at the issue tracker b/203061533#comment6.

BUG=b:203061533

Change-Id: I7aa8c594d9f5caa6b2523dac079aef89e623c56f
Signed-off-by: Zheng Bao <fishbaozi@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59919
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Huang <patrick.huang@amd.corp-partner.google.com>
Reviewed-by: Jason Glenesk <jason.glenesk@gmail.com>
Reviewed-by: Raul Rangel <rrangel@chromium.org>

0 files changed, 0 insertions, 0 deletions