yorp: fix inverted logic for dead battery mode
yorp: fix inverted logic for dead battery mode

BRANCH=none
BUG=b:77561535
TEST=yorp P1 can still boot without battery

Change-Id: Ifa327e2989ac3dfe260b570edbc23add4910e09f
Signed-off-by: Jett Rink <9d4aef0593e6843318d99df31597fb6153b89787@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/998410
Reviewed-by: Furquan Shaikh <6be5c96c464778f89679b1062a2e0a6af93d2aa5@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec