fix [BUG] RP2040 ADC Engine #264

Author: Richard Unger

src/current_sense/hardware_specific/rp2040/rp2040_mcu.cpp

@@ -10,6 +10,7 @@
 #include "hardware/dma.h"
 #include "hardware/irq.h"
 #include "hardware/pwm.h"
+#include "hardware/adc.h"
 
 
 /* Singleton instance of the ADC engine */