thermal: Update chamber test property Remove unnecessary setting for persist.vendor.disable.usb.overheat.mitigation Bug: 144270230 Test: setprop persist.vendor.disable.usb.overheat.mitigation 0/1 and check behavior Test: pts-tradefed run pts -m PtsThermalHalTestCases Change-Id: I4a32f165a033f82737de019ab2fed6b68b2f508a