Add shutdown to tradeinmode

Allow tradeinmode access to powerctl property

Test: manual
Bug: 384054216
Flag: com.android.tradeinmode.flags.enable_trade_in_mode
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:ba30c136c8d0c7588569a6e192dfc6838e7f2e1a)
Merged-In: Iaca103170f43c7a50f032f9dfa0b91982599921e
Change-Id: Iaca103170f43c7a50f032f9dfa0b91982599921e
diff --git a/private/tradeinmode.te b/private/tradeinmode.te
index dca1bc1..99035f8 100644
--- a/private/tradeinmode.te
+++ b/private/tradeinmode.te
@@ -22,6 +22,7 @@
 get_prop(tradeinmode, odsign_prop)
 get_prop(tradeinmode, build_attestation_prop)
 get_prop(tradeinmode, adbd_tradeinmode_prop)
+set_prop(tradeinmode, powerctl_prop)
 
 # Needed to start activities through "am".
 binder_call(tradeinmode, system_server)