Add Flower (Sam) shape to icon shape overlay (will show up in custom options)

https://screenshot.googleplex.com/0i9YmgFDuYB

Bug: 150234338
Test: installed the apk and then changed it in custom style options
$ adb install out/target/product/generic/system/product/overlay/IconShapeFlower/IconShapeFlowerOverlay.apk

Change-Id: I03ad33f4f9a14cebb1e50af15035b48dcbfd97d5