Revert "Refactor Utilities#isTablet to Utilities#isLargeScreen"

Revert submission 21508490-is-tablet-misleading

Reason for revert: DroidMonitor: Potential culprit for Bug b/270566727
Reverted changes: /q/submissionid:21508490-is-tablet-misleading

ABTD build successfully: https://android-build.googleplex.com/builds/abtd/run/L51700000958776445

Change-Id: I1bf2ef3e38bba5591aac7d50dbca4302d1a5d5e2
BUG: