Asan_extract: Use sys.powerctl

rc-style powerctl has beem removed. Accordingly, asan_extract now
needs to access sys.powerctl directly.

Bug: 36458146
Test: m && m SANITIZE_TARGET=address SANITIZE_TARGET_SYSTEM=true
Change-Id: Ic65a858962b4b3dd613fdbfa09f93d21425bf892
diff --git a/rootdir/asan_extract.sh b/rootdir/asan_extract.sh
index 8d626b3..2d72320 100644
--- a/rootdir/asan_extract.sh
+++ b/rootdir/asan_extract.sh
@@ -92,4 +92,4 @@
 
 log -p i -t asan_install "Signaling init to reboot..."
 
-setprop asan.restore_reboot 1
+setprop sys.powerctl reboot