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: If609d76b224228061021fdc1463b6e8dfb6170ca

dumpstate/DumpstateDevice.cpp

@@ -1009,6 +1009,9 @@ void DumpstateDevice::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);
         }
     }
 }