Populate activeApexChanged in ActiveApexInfo

PackageManager and ART wants to know whether a different version of an
APEX was activated during this boot compared to the last boot. This
change populates this field from binder call to apexd.

In a follow up CL PackageManager will use that information to drop
apk-in-apex cache on APEX updates.

Test: atest ApexManagerTest
Bug: 225435110
Change-Id: I0ecdf758567fb8677a676d7c39f6b35cdc1208ac