The values from auxadc may be incorrect if not calibrated by efuse. Without calibration, the value error range is about +/-50mv, and after being calibrated the error range is about +/-10mv. BUG=b:131391176 TEST=make clean && make test-abuild; boots on Kukui rev 2 units. BRANCH=none Change-Id: Iccd6ea0ad810c993f9b62c0974279c960f890e52 Signed-off-by: Po Xu <jg_poxu@mediatek.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/32800 Reviewed-by: Julius Werner <jwerner@chromium.org> Reviewed-by: JG Poxu <jg_poxu@mediatek.corp-partner.google.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>