SetupWizard: declare setupwizard category in manifest

In case there's more than one setup wizard package, we can only grant
permissions to one by default. That is queried by the
Intent.CATEGORY_SETUP_WIZARD which needs to be declared so we are in the
line up to receive the permission.

Change-Id: Ia9bf7ef2dfdaedfc567f038cd860abafa0e2d657
Signed-off-by: Roman Birg <roman@cyngn.com>