iio: accel: Switch to sparse friendly iio_device_claim/release_direct()

iio: accel: Switch to sparse friendly iio_device_claim/release_direct()

Single patch for the simple cases in accelerometer drivers.

These new functions allow sparse to find failures to release
direct mode reducing chances of bugs over the claim_direct_mode()
functions that are deprecated.

Cc: Antoniu Miclaus <antoniu.miclaus@analog.com>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20250217140135.896574-9-jic23@kernel.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>