apply @gen2thomas suggestions

internal/legacy/pinhal_go.go

@@ -0,0 +1,9 @@
+//go:build !baremetal
+
+package legacy
+
+func configurePinOut(p PinOutput)          {}
+func configurePinInput(p PinInput)         {}
+func configurePinInputPulldown(p PinInput) {}
+func configurePinInputPullup(p PinInput)   {}
+func pinIsNoPin(a any) bool                { return false }