iio: imu: adis16480.c: Add delta angle and delta velocity channels

iio: imu: adis16480.c: Add delta angle and delta velocity channels

Add support for delta angle and delta velocity raw readings to
adis16480 driver.
The following devices do not support delta readings in burst mode:
ADIS16375, ADIS16480, ADIS16485, ADIS16488, ADIS16490, ADIS16495-1,
ADIS16495-2, ADIS16495-3, ADIS16497-1, ADIS16497-2, ADIS16497-3, thus
they cannot be retrieved via the buffer interface.
For these devices, the delta measurements are retrieved by performing
normal register readings and are made available through the raw
attributes of the specific channels.

Signed-off-by: Ramona Gradinariu <ramona.gradinariu@analog.com>
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20240528142409.239187-3-ramona.gradinariu@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>