Correct offset calibration (#7228)

Co-authored-by: descipher <mike.laspina@gelidus.ca>
Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

tests/components/atm90e32/test.rp2040-ard.yaml

@@ -7,6 +7,7 @@ spi:
 sensor:
   - platform: atm90e32
     cs_pin: 5
+    id: chip1
     phase_a:
       voltage:
         name: EMON Line Voltage A
@@ -49,3 +50,11 @@ sensor:
     line_frequency: 60Hz
     current_phases: 3
     gain_pga: 2X
+    enable_offset_calibration: True
+button:
+  - platform: atm90e32
+    id: chip1
+    run_offset_calibration:
+      name: "Chip1 - Run Offset Calibration"
+    clear_offset_calibration:
+      name: "Chip1 - Clear Offset Calibration"