mb/google/skyrim/var/winterhold: Set system_configuration to 3 to avoid SMU call

Update system_configuration to 3 for 15W. Specification "FT6
Infrastructure Roadmap #57316" incorrectly lists system config index of
4 for 15W. Setting to 4 will cause an additional call to the SMU that is
not needed and will add boot delay. Both SMU and FSP interpret configs >
3 as 3.

BUG=b:267294958
TEST=Confirm extra message "Service Request 0x5F" not in log.

Change-Id: Ib12c73f95030625b52e26f86e932ee2aaa6ea522
Signed-off-by: Jason Glenesk <jason.glenesk@amd.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76096
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-by: Tim Van Patten <timvp@google.com>
Reviewed-by: Martin Roth <martin.roth@amd.corp-partner.google.com>

0 files changed, 0 insertions, 0 deletions