samd/modmachine: Make some machine classes configurable by #defines.

These include ADC, DAC, I2C, SoftI2C, SPI, SoftI2C, PWM, UART, pulse.  This
is useful for devices like the Adafruit Trinket series which have almost no
accessible GPIO pins.

Signed-off-by: robert-hh <robert@hammelrath.com>

ports/samd/main.c

@@ -81,12 +81,18 @@ void samd_main(void) {
 
     soft_reset_exit:
         mp_printf(MP_PYTHON_PRINTER, "MPY: soft reboot\n");
+        #if MICROPY_PY_MACHINE_ADC
         adc_deinit_all();
+        #endif
         pin_irq_deinit_all();
+        #if MICROPY_PY_MACHINE_PWM
         pwm_deinit_all();
+        #endif
         soft_timer_deinit();
         gc_sweep_all();
+        #if MICROPY_PY_MACHINE_I2C || MICROPY_PY_MACHINE_SPI || MICROPY_PY_MACHINE_UART
         sercom_deinit_all();
+        #endif
         mp_deinit();
     }
 }