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.

(cherry picked from commit 8706a98aa635236a95795f0a0c122bb3e591a50d)

Change-Id: I79789a151f6faafda8ecc6198c2182cc2a91da70
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;