Use ConstraintLayout for Theme and Grid picker

- I was changing they to use LinearLay by ag/11453761 and ag/11439238, but they will break when font and display size are large...so the cl is to add ConstraintLayout back.
Before:
https://screenshot.googleplex.com/a4OTafHQkrq.png
https://screenshot.googleplex.com/SEXka81XfYk.png

After:
https://screenshot.googleplex.com/FRNKTMcEMVj.png
https://screenshot.googleplex.com/3ow1Y8NnkzH.png

Test: Manually
Bug: 157111978
BUg: 156059583
Change-Id: Ibd4e636e23a531d896535f2dbd235c3dcaa2ba0f