Splitting system_app (b/264266705) caused the avc denial below,
causing b/269981541. This change allows the denied binder call
and fixes the bug.
Denial message:
avc: denied { call } for scontext=u:r:twoshay:s0 tcontext=u:r:systemui_app:s0:c230,c256,c512,c768 tclass=binder permissive=0
Note: this is a re-submit of ag/21529713, after sorting out the
SEPolicy issues described in b/270444888.
Test: flash P23 and Bluejay devices with this change plus ag/21591673,
run `adb shell device_config put twoshay_native test_flag_name test_flag_value`,
→ TouchContextService.java logs corresponding property changed message.
Bug: 270444888
Change-Id: I40d70cf19930eb334ba3250d58a0cbc39b50764b