Put RFFC5071 code back in place.

firmware/usb_performance/usb_performance.c

@@ -29,6 +29,7 @@
 #include <hackrf_core.h>
 #include <max5864.h>
 #include <max2837.h>
+#include <rffc5071.h>
 #include <sgpio.h>
 
 #include "usb.h"
@@ -276,14 +277,14 @@ int main(void) {
     ssp1_init();
 	ssp1_set_mode_max2837();
 	max2837_setup();
-	/*
+
 	rffc5071_setup();
 #ifdef JAWBREAKER
 	switchctrl = (SWITCHCTRL_AMP_BYPASS | SWITCHCTRL_HP);
 #endif
 	rffc5071_rx(switchctrl);
 	rffc5071_set_frequency(500, 0); // 500 MHz, 0 Hz (Hz ignored)
-	*/
+
 	max2837_set_frequency(freq);
 	max2837_start();
 	max2837_rx();