iio: light: rohm-bu27034: remove unused struct 'bu27034_result'

'bu27034_result' is unused since the original
commit e52afbd6 ("iio: light: ROHM BU27034 Ambient Light Sensor").

Remove it.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Acked-by: Matti Vaittinen <mazziesaccount@gmail.com>
Link: https://lore.kernel.org/r/20240522230457.478156-4-linux@treblig.org


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>