Nissan: Enable steering at standstill (commaai#2812)

* Enable steering at standstill for Nissan cars

* Update LKAS_MAX_TORQUE value to improve steering speed

Increased LKAS_MAX_TORQUE from 1 to 2.54 for better performance.

* Update carcontroller.py

* Revert "Update LKAS_MAX_TORQUE value to improve steering speed"

This reverts commit d490162.

* Revert "Update carcontroller.py"

This reverts commit 431b6c0.

Author: gncnpk

opendbc/car/nissan/interface.py

@@ -15,6 +15,7 @@ def _get_params(ret: structs.CarParams, candidate, fingerprint, car_fw, alpha_lo
     ret.brand = "nissan"
     ret.safetyConfigs = [get_safety_config(structs.CarParams.SafetyModel.nissan)]
     ret.autoResumeSng = False
+    ret.steerAtStandstill = True
 
     ret.steerLimitTimer = 1.0