Instead of using a hard-coded value leverage the existing definitions to perform GPE0 block length calculations. There are 4 pairs of 32-bit status/enable registers. BUG=chrome-os-partner:43522 BRANCH=None TEST=Built and booted glados. Original-Change-Id: I14d08298b5750c91ce0ac3fa33569813396f7089 Original-Signed-off-by: Aaron Durbin <adurbin@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/291932 Original-Reviewed-by: Duncan Laurie <dlaurie@chromium.org> Change-Id: I127f026f15180fa79625d4cad96d5e35f85e5090 Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/11205 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <pgeorgi@google.com>