init: Add activation logs for flattened APEX folders with details

 * Adapt 'GetApexName' to 'GetApexManifest' (based on Android 12)
 * Add activation logs for every 'ActivateFlattenedApexesFrom'

 * Emulates the file-based logs in dmesg of the following commit:
   'init: generate apex-info-list.xml'
   Change-Id: I74a4d0ee363761564225097c5949e5ce335ac6dc

Change-Id: I1ebf8506d5cc1befa000fb11dcc604d7cfe8e9a7
Signed-off-by: Adrian DC <radian.dc@gmail.com>