Do not propagate strict updatability linting to libcore/

propogation of this flag is determined by the location of the Android.bp
where a library is defined.
libcore/ libraries that are transtive deps of updatable apexes will
- inherit strict_updatability_linting:true if defined in libcore root
- not inherit strict_updatability_linting:true if defined in libcore
  subdir

Note that the module can explicitly list `lint:{strict_updatability_linting: true}'
in their Android.bp file, in which case they will not be allowed to
baseline NewApi errors

Test: m lint-check
Test: TH
Bug: 208656169
Bug: 182349282

Change-Id: I4c373b2960a7af16301d7f06aab448f39b937ea9