Change the access of cellX/Y of CellLayoutLayoutParams to private

Bug: 188081026
Test: no op change, should compile
Test: ReorderWidgets
Change-Id: I20367974e5a4cead406e18eb66dafd4d59651b2a
Merged-In: I20367974e5a4cead406e18eb66dafd4d59651b2a
11 files changed