copy/paste error

Author: dhalbert

ports/atmel-samd/mpconfigport.mk

@@ -15,7 +15,7 @@ MPY_TOOL_LONGINT_IMPL = -mlongint-impl=longlong
 endif
 
 # Put samd21-only choices here.
-ifeq ($(CHIP_FAMILY),samd51)
+ifeq ($(CHIP_FAMILY),samd21)
 # frequencyio not yet verified as working on SAMD21.
 CIRCUITPY_FRQUENCYIO = 0
 endif