zephyr/modzsensor: Rename "TEMP" sensor channel to "DIE_TEMP".

I.e. on-die temperature sensor.  Upstream made more fine-grained channels
for different kinds of temperature.

ports/zephyr/modzsensor.c

@@ -127,7 +127,7 @@ STATIC const mp_rom_map_elem_t mp_module_zsensor_globals_table[] = {
     C(MAGN_X),
     C(MAGN_Y),
     C(MAGN_Z),
-    C(TEMP),
+    C(DIE_TEMP),
     C(PRESS),
     C(PROX),
     C(HUMIDITY),