restore I2C and UART. Don't do port.c resets and inits for modules that are not available.

ports/atmel-samd/supervisor/port.c

@@ -190,7 +190,10 @@ safe_mode_t port_init(void) {
 
     // Configure millisecond timer initialization.
     tick_init();
+
+#ifndef PIRKEY_M0
     rtc_init();
+#endif
 
     // Init the nvm controller.
     // struct nvm_config config_nvm;
@@ -249,18 +252,19 @@ void reset_port(void) {
     pulsein_reset();
     pulseout_reset();
     pwmout_reset();
+
+#ifndef PIRKEY_M0
+    analogin_reset();
+    analogout_reset();
     rtc_reset();
+#endif
 
     reset_gclks();
 
-    analogin_reset();
-
 #ifdef CIRCUITPY_GAMEPAD_TICKS
     gamepad_reset();
 #endif
 
-    analogout_reset();
-
     reset_event_system();
 
     reset_all_pins();

shared-bindings/busio/__init__.c

@@ -87,13 +87,10 @@
 
 STATIC const mp_rom_map_elem_t busio_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_busio) },
-    { MP_ROM_QSTR(MP_QSTR_SPI),   MP_ROM_PTR(&busio_spi_type) },
-// a pIRKey does not need these. Remove them to make room for frozen modules.
-#ifndef PIRKEY_M0
     { MP_ROM_QSTR(MP_QSTR_I2C),   MP_ROM_PTR(&busio_i2c_type) },
+    { MP_ROM_QSTR(MP_QSTR_SPI),   MP_ROM_PTR(&busio_spi_type) },
     { MP_ROM_QSTR(MP_QSTR_OneWire),   MP_ROM_PTR(&busio_onewire_type) },
     { MP_ROM_QSTR(MP_QSTR_UART),   MP_ROM_PTR(&busio_uart_type) },
-#endif
 };
 
 STATIC MP_DEFINE_CONST_DICT(busio_module_globals, busio_module_globals_table);