iio: bmc150-accel-core: Use iio_read_acpi_mount_matrix() helper

Replace the duplicate ACPI "ROTM" data parsing code with the new
shared iio_read_acpi_mount_matrix() helper.

Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20240425125754.76010-4-hdegoede@redhat.com


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