Define llndk modules instead of vndk_package

vndk_package installs more than VNDK APEX, which includes LLNDK for
system and some core modules with vendor variant. This change adds a new
target llndk_in_system to instal LLNDK modules in the system image and
use this package if VNDK is deprecated

Bug: 299197187
Test: Cuttlefish and Cheetah boot succeeded without error
Change-Id: I9fe1114fdcb65c6143b5f734425c878a29138d0b