Create new Keystore2 java_aconfig_library

In order to flag frameworks code using Keystore2 flags, create a new
library specifically for frameworks that depends on
`framework-minus-apex-aconfig-java-defaults`. Without this (e.g. if
`keystore2_flags_java` is used instead), a flag cycle dependency is
created (b/293195086).

Bug: 369375199
Test: treehugger
Change-Id: I5f039a3c4a69eb6fb8c21fbf5849a85dea49e8f5
1 file changed