esp32: Fix machine.TouchPad startup on ESP32-S2 and S3.

Closes #13178.

TouchPad confirmed working on both chips, and fixes the the ESP32-S3
reading constant max value. Was unable to reproduce the bug on ESP32-S2 but
this may be due to my test setup, and it still works with the fix.

This work was funded through GitHub Sponsors.

Signed-off-by: Angus Gratton <angus@redyak.com.au>

ports/esp32/machine_touchpad.c

@@ -96,9 +96,6 @@ static mp_obj_t mtp_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_
     if (!initialized) {
         touch_pad_init();
         touch_pad_set_fsm_mode(TOUCH_FSM_MODE_TIMER);
-        #if TOUCH_HW_VER == 2
-        touch_pad_fsm_start();
-        #endif
         initialized = 1;
     }
     #if SOC_TOUCH_VERSION_1
@@ -107,6 +104,10 @@ static mp_obj_t mtp_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_
     esp_err_t err = touch_pad_config(self->touchpad_id);
     #endif
     if (err == ESP_OK) {
+        #if SOC_TOUCH_VERSION_2
+        touch_pad_fsm_start();
+        #endif
+
         return MP_OBJ_FROM_PTR(self);
     }
     mp_raise_ValueError(MP_ERROR_TEXT("Touch pad error"));