Sort keyboard layouts

At the moment it's not easy to find a layout in the physical
keyboard layout list as they are not sorted; this CL will sort the
keyboard layout list before it is  presented to the user.

Bug: 279281653
Test: Flashed on device, confirmed the layout list is sorted
Change-Id: Ibc7e329190785cce9a8d9c33bc2fcaca6b8c169a