launcher: create a device profile for foldables

This creates a device_profiles_split.xml that will be used when the
device is a foldable. This makes the changes contained for specific
devices and make it possible to use different padding files in the
future if needed.

Bug: 191879424
Test: tested with NexusLauncher and Launcher3, in foldables and
handhelds
Test: check that 4x4 is not scalable anymore on handhelds by using HSV

Change-Id: If6ef14e3611c5252634c080643433545ce186f0d