docs: add comma power for Nissan (commaai#2034)

The [Nissan A][1] and B harnesses do not have 12VIN, only IGN, so
presumably they need a comma power too. It [looks like][2] they are
already shipped with them.

[1] https://github.com/commaai/hardware/blob/master/harness/v3/Nissan_A_Harness.pdf
[2] https://discord.com/channels/469524606043160576/580827831307599872/1265508977626845279

Author: incognitojam

opendbc/car/docs_definitions.py

@@ -131,8 +131,8 @@ class CarHarness(EnumBase):
   obd_ii = BaseCarHarness("OBD-II connector", parts=[Cable.long_obdc_cable, Cable.usbc_coupler], has_connector=False)
   gm = BaseCarHarness("GM connector", parts=[Accessory.harness_box])
   gmsdgm = BaseCarHarness("GM SDGM connector", parts=[Accessory.harness_box, Cable.long_obdc_cable, Cable.usbc_coupler, Accessory.comma_power_v2])
-  nissan_a = BaseCarHarness("Nissan A connector", parts=[Accessory.harness_box, Cable.long_obdc_cable, Cable.usbc_coupler])
-  nissan_b = BaseCarHarness("Nissan B connector", parts=[Accessory.harness_box, Cable.long_obdc_cable, Cable.usbc_coupler])
+  nissan_a = BaseCarHarness("Nissan A connector", parts=[Accessory.harness_box, Accessory.comma_power_v2, Cable.long_obdc_cable, Cable.usbc_coupler])
+  nissan_b = BaseCarHarness("Nissan B connector", parts=[Accessory.harness_box, Accessory.comma_power_v2, Cable.long_obdc_cable, Cable.usbc_coupler])
   mazda = BaseCarHarness("Mazda connector")
   ford_q3 = BaseCarHarness("Ford Q3 connector")
   ford_q4 = BaseCarHarness("Ford Q4 connector", parts=[Accessory.harness_box, Accessory.comma_power_v2, Cable.long_obdc_cable, Cable.usbc_coupler])