Change icon for Private Space unlocked and setup success toast

Change is made to show customised icon in Toast message shown by using
Toast.makeCustomToastWithIcon()

Screenshots :
go/ss/AcaRQUJQfh79wDw.png
go/ss/5j4oD8xydwX7HTX.png

Bug: 329391204
Bug: 309575523
Test: Manual
Change-Id: I336d7d0419b1de60024e584e943a725662b446a9