sensor_angle: Add support for bulk querying of spi angle sensors

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

src/spicmds.c

@@ -70,6 +70,18 @@ spidev_set_software_bus(struct spidev_s *spi, struct spi_software *ss)
     spi->flags |= SF_SOFTWARE;
 }
 
+int
+spidev_have_cs_pin(struct spidev_s *spi)
+{
+    return spi->flags & SF_HAVE_PIN;
+}
+
+struct gpio_out
+spidev_get_cs_pin(struct spidev_s *spi)
+{
+    return spi->pin;
+}
+
 void
 spidev_transfer(struct spidev_s *spi, uint8_t receive_data
                 , uint8_t data_len, uint8_t *data)