sw: add initial tests for spi and rgb

These tests are still a work-in-progress, but they form the basis of
what will be the factory test.

Signed-off-by: Sean Cross <sean@xobs.io>

sw/src/main.c

@@ -22,13 +22,11 @@ void isr(void)
 static void init(void)
 {
     rgb_init();
-    spi = spiAlloc();
-    spiInit(spi);
+    spi_init();
     irq_setmask(0);
     irq_setie(1);
     usb_init();
     time_init();
-
 }
 
 int main(int argc, char **argv)