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
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:1337a88d112b005f897b3745b5475cf7d4764db7)
Merged-In: I8f52d5f86e6ffaccd624846fbe1ba0a8fc842af6
Change-Id: I8f52d5f86e6ffaccd624846fbe1ba0a8fc842af6
Prior cl, ag/24720067, was reverted due to platinum failed,
this cl fixes the fails (NPE on UDFPS).
Bug: 288155127
Bug: 305132251
Test: Manually check on Lynx and Felix
Test: atest BiometricsE2eTests:FingerprintEnrollSuccessTest
Test: abtd for platinum, see b/305048300#comment14
Change-Id: I90f4ea14853edf03abd8ffe0b7874894eb2d4f81