[boot] start using new session targets

Signed-off-by: Pekka Lundstrom <pekka.lundstrom@jollamobile.com>
Removed mapplauncherd.target

Signed-off-by: Pekka Lundstrom <pekka.lundstrom@jollamobile.com>
Removed mappaluncherd.target from makefile

Signed-off-by: Pekka Lundstrom <pekka.lundstrom@jollamobile.com>
Merge pull request #5 from plundstr/master

Start using new user session targets