Support wallpaper on secondary displays.(3/N)

The launchers which running on secondary displays can set the desired
wallpaper dimensions and paddings on correct display.
Preset reasonable wallpaper size for newly added displays.
Add some error handling between the binder calls.

Note: We still only save/load wallpaper info for default display, as most of
time secondary displays are not fixed.

Bug: 115486823
Test: atest WallpaperManagerTest
Test: atest WmTests
Test: atest ActivityManagerMultiDisplayTests

Change-Id: Ifd1a96fa185f2d75825c6fe8d3db69466b31c5c8