This reverts commit 6e1b274f03.
A system partition cannot have the aconfigs of other partitions.
Revive the system_ext container for system_ext aconfigs.
Bug: 385213580
Test: "adb shell aflags list" must not be changed.
Flag: EXEMPT refactor
Change-Id: I8f52d5f86e6ffaccd624846fbe1ba0a8fc842af6