Navbar: add resize preferences

seekbar slider preferences to resize the navbar in portrait
or landscape display

-VanirAOSP

PS2: add density dependent minimum and maximum values FTW
PS3: hide the non-applicable option for phone/tablet layouts
PS4: remove unused seekbar preference class
PS5: reset seekbar progress onResume

Change-Id: Ida22bfea7b21b56a8b88f0484cd63f9cc9ff5974
Merge "Navbar: add resize preferences" into kk44