Add license metadata declarations.

They are moved from:
- device/generic/car/Android.mk
- device/generic/trusty/Android.mk
- device/generic/uml/Android.mk
- device/google_car/common/Android.mk
- device/google/atv/Android.mk

With this CL the Android.mk files can be deleted.

Bug: 309884347
Test: CIs
Change-Id: I8c27c1add6c27eb8d651779f39bb4d951acaf613