Replace addItemDecoration with layout_margin

car-ui-lib no longer supports addItemDecoration for phase2.
With this change we're replacing the usage of addItemDecoration
with layout_margin in the item's layout file.

Bug: 206038962
Bug: 203713746
Test: manually
Change-Id: If6cf393f9d771e38f92d792f5b405380233f4f24
4 files changed