Add waterPlant stub and update pump usage

firmware/atmega/source/pump.c

@@ -1,6 +1,7 @@
 #include <stdint.h>
 #include <avr/io.h>
 #include <avr/interrupt.h>
+#include "config.h"
 
 void pumpsInit(void) {
     // Set as input
@@ -22,3 +23,8 @@ void triggerPump(int8_t pump_pin, int16_t milliseconds) {
     // Turn off pump
     PORTD &= ~(1 << pump_pin);
 }
+
+void waterPlant(void) {
+    //for each pump --> turn em on
+    //better to have it here as function instead of doing it in main
+}