Whitelist reboot reasons related to userspace reboot failure

Test: system/core/bootstat/boot_reason_test.sh
Bug: 135984674
Change-Id: I31422329f1109273909293a83913ae801eb1fe52
diff --git a/bootstat/bootstat.cpp b/bootstat/bootstat.cpp
index d08a59f..6409db0 100644
--- a/bootstat/bootstat.cpp
+++ b/bootstat/bootstat.cpp
@@ -312,6 +312,11 @@
     {"reboot,unknown[0-9]*", 183},
     {"reboot,longkey,.*", 184},
     {"reboot,boringssl-self-check-failed", 185},
+    {"reboot,userspace_failed,shutdown_aborted", 186},
+    {"reboot,userspace_failed,watchdog_triggered", 187},
+    {"reboot,userspace_failed,watchdog_fork", 188},
+    {"reboot,userspace_failed,*", 189},
+    {"reboot,mount_userdata_failed", 190},
 };
 
 // Converts a string value representing the reason the system booted to an