sx127x: add RadioController interface to match sx126x

Signed-off-by: deadprogram <ron@hybridgroup.com>

sx127x/radiocontrol.go

@@ -0,0 +1,10 @@
+package sx127x
+
+// SX127X radio transceiver has several pins that control NSS,
+// and that are signalled when RX or TX operations are completed.
+// This interface allows the creation of types that can control this
+type RadioController interface {
+	Init() error
+	SetNss(state bool) error
+	SetupInterrupts(handler func()) error
+}