iio:triggers Protect functions in triggers.h from use when not compiled

Also include a couple of forward defs of struct iio_trigger and struct
iio_trigger_ops to avoid doing this in each driver.

Signed-off-by: Jonathan Cameron <[e-mail]>
Reported-by: Randy Dunlap <[e-mail]>
Acked-by: Denis Ciocca <[e-mail]>

include/linux/iio/trigger.h

···
 #ifndef _IIO_TRIGGER_H_
 #define _IIO_TRIGGER_H_
 
+#ifdef CONFIG_IIO_TRIGGER
 struct iio_subirq {
 	bool enabled;
 };
···
 __printf(1, 2) struct iio_trigger *iio_trigger_alloc(const char *fmt, ...);
 void iio_trigger_free(struct iio_trigger *trig);
 
+#else
+struct iio_trigger;
+struct iio_trigger_ops;
+#endif
 #endif /* _IIO_TRIGGER_H_ */