Dump usf stats history in bugreports.

USF saves a stat buffer to the filesystem periodically. Dump this as
part of bugreports.

Bug: 242320914
Test: Stats are visible in a bugreport.
Change-Id: I2020f48026fcad19e41c8959e404e0a0783a2ef0

dumpstate/Dumpstate.cpp

@@ -1066,6 +1066,9 @@ void Dumpstate::dumpSensorsUSFSection(int fd) {
             RunCommandToFd(fd, "USF Registry",
                            {"/vendor/bin/sh", "-c", "usf_reg_edit save -"},
                            options);
+            RunCommandToFd(fd, "USF Last Stat Buffer",
+                           {"/vendor/bin/sh", "-c", "cat /data/vendor/sensors/debug/stats.history"},
+                           options);
         }
     }
 }