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: NJonathan Cameron <jic23@kernel.org>
Reported-by: NRandy Dunlap <rdunlap@infradead.org>
Acked-by: NDenis Ciocca <denis.ciocca@st.com>