rp2/modmachine: Enable machine.Signal class.
Fixes issue
#include "extmod/machine_i2c.h"
#include "extmod/machine_mem.h"
#include "extmod/machine_pulse.h"
+#include "extmod/machine_signal.h"
#include "extmod/machine_spi.h"
#include "modmachine.h"
@@ -163,6 +164,7 @@ STATIC const mp_rom_map_elem_t machine_module_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR_SoftI2C), MP_ROM_PTR(&mp_machine_soft_i2c_type) },
{ MP_ROM_QSTR(MP_QSTR_Pin), MP_ROM_PTR(&machine_pin_type) },
{ MP_ROM_QSTR(MP_QSTR_PWM), MP_ROM_PTR(&machine_pwm_type) },
+ { MP_ROM_QSTR(MP_QSTR_Signal), MP_ROM_PTR(&machine_signal_type) },
{ MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&machine_spi_type) },
{ MP_ROM_QSTR(MP_QSTR_SoftSPI), MP_ROM_PTR(&mp_machine_soft_spi_type) },
{ MP_ROM_QSTR(MP_QSTR_Timer), MP_ROM_PTR(&machine_timer_type) },
