bootstat: uvlo -> reboot,undervoltage

uvlo anywhere in boot loader reason string will match and convert to
reboot,undervoltage when propagated to system boot reason.

Test: compile
Bug: 63736262
Change-Id: I14b0b7e8185aa4fb519efdb6cb1306718e9de69c
diff --git a/bootstat/bootstat.cpp b/bootstat/bootstat.cpp
index c17e00f..f25c5d1 100644
--- a/bootstat/bootstat.cpp
+++ b/bootstat/bootstat.cpp
@@ -236,7 +236,7 @@
     {"reboot,rescueparty", 90},
     {"charge", 91},
     {"oem_tz_crash", 92},
-    {"uvlo", 93},
+    {"uvlo", 93},  // aliasReasons converts to reboot,undervoltage
     {"oem_ps_hold", 94},
     {"abnormal_reset", 95},
     {"oemerr_unknown", 96},
@@ -263,7 +263,7 @@
     {"oem_crash_on_the_lk", 117},
     {"oem_rpm_reset", 118},
     {"REUSE1", 119},  // Former dupe, can be re-used
-    {"REUSE2", 120},  // Former dupe, can be re-used
+    {"reboot,undervoltage", 120},
     {"factory_cable", 121},
     {"oem_ar6320_failed_to_powerup", 122},
     {"watchdog_rpm_bite", 123},
@@ -840,6 +840,7 @@
         {"reboot,tool", "tool_by_pass_pwk"},
         {"!reboot,longkey", "reboot_longkey"},
         {"!reboot,longkey", "kpdpwr"},
+        {"!reboot,undervoltage", "uvlo"},
         {"bootloader", ""},
     };