Configure 'no wallpaper service' for slim image to improve boot times.

The WindowManagerService waits for the wallpaper service to be running
for up to 30 seconds before enabling the display. The slim image does
not have a wallpaper service, so cold boot times were always taking 30
seconds longer than they should.

This commit sets the framework config 'config_enableWallpaperService'
to false, skipping the unnecessary 30 second wait.

Cold boot times:
Before: ~56s
After: ~26s
Baseline sdk_phone_x86-userdebug: ~31s

Test: emulator boot, cts-tradefed
Bug: 206115935,227808088
Change-Id: I4b1905eee40d15d9c598c80e087ee31a9c58cac6
Merged-In: I4b1905eee40d15d9c598c80e087ee31a9c58cac6
(cherry picked from commit c4611a8ddee745484eafff159860f9eeba852f27)
1 file changed