Initialize SPI on start-up

Now that we have a SPI driver, we must init it when we start up.

BUG=chromium-os:28925
TEST=build on daisy and discovery; run on daisy

Change-Id: I84b458d3ebc3fed9368dce8e06d040dbfc4e9125
Signed-off-by: Simon Glass <sjg@chromium.org>

common/main.c

@@ -27,6 +27,7 @@
 #include "power_button.h"
 #include "powerdemo.h"
 #include "pwm.h"
+#include "spi.h"
 #include "system.h"
 #include "task.h"
 #include "temp_sensor.h"
@@ -118,6 +119,9 @@ int main(void)
 	lpc_init();
 	uart_comx_enable();
 #endif
+#ifdef CONFIG_SPI
+	spi_init();
+#endif
 #ifdef CONFIG_PWM
 	pwm_init();
 #endif