fix build issues

ports/atmel-samd/Makefile

@@ -245,6 +245,7 @@ SRC_C = \
 	reset.c \
 	supervisor/shared/memory.c \
 	tick.c \
+	timer_handler.c \
 
 
 ifeq ($(CIRCUITPY_NETWORK),1)

ports/atmel-samd/timer_handler.c

@@ -30,7 +30,6 @@
 #include "timer_handler.h"
 
 #include "common-hal/pulseio/PulseOut.h"
-#include "common-hal/pulseio/FrequencyIn.h"
 
 static uint8_t tc_handler[TC_INST_NUM];
 
@@ -47,8 +46,6 @@ void shared_timer_handler(bool is_tc, uint8_t index) {
         uint8_t handler = tc_handler[index];
         if (handler == TC_HANDLER_PULSEOUT) {
             pulseout_interrupt_handler(index);
-        } else if (handler == TC_HANDLER_FREQUENCYIN) {
-            frequencyin_interrupt_handler(index);
         }
     }
 }

ports/atmel-samd/timer_handler.h

@@ -28,7 +28,6 @@
 
 #define TC_HANDLER_NO_INTERRUPT 0x0
 #define TC_HANDLER_PULSEOUT 0x1
-#define TC_HANDLER_FREQUENCYIN 0x2
 
 void set_timer_handler(bool is_tc, uint8_t index, uint8_t timer_handler);
 void shared_timer_handler(bool is_tc, uint8_t index);