Use pixels as breakpoints for non-desktop grid sizes

Effectively reverts CL:33454986 and adds float min device width/height
attributes that specify dimensions as number of dp. Currently, dp
dimensions are only used for desktop devices.

Test: Existing tests
Bug: 375643744
Flag: com.android.launcher3.enable_scalability_for_desktop_experience
Change-Id: I8a2bb3b9e6f97987fb25db553fc628d30cd3bf7c
3 files changed