Adding support for quiescent reboot to recovery

Bug: 37401320
Test: build and push OTA and hit adb reboot recovery,quiescent. The screen should remain off throughout the upgrade process.
Change-Id: Ibed3795c09e26c4fa73684d40b94e40c78394d3f
diff --git a/ui.cpp b/ui.cpp
index 9194ae3..cad7449 100644
--- a/ui.cpp
+++ b/ui.cpp
@@ -227,7 +227,7 @@
 
           case RecoveryUI::REBOOT:
             if (reboot_enabled) {
-                android::base::SetProperty(ANDROID_RB_PROPERTY, "reboot,");
+                reboot("reboot,");
                 while (true) { pause(); }
             }
             break;