When using ACPI, id is NULL and the current code automatically
defaults name to NULL and chip id to 0. We should instead use
the data provided in the ACPI device table.

Fixes: c816d9e7 ("iio: imu: mpu6050: fix possible NULL dereferences")
Signed-off-by: NDaniel Baluta <daniel.baluta@intel.com>
Reviewed-By: NMatt Ranostay <matt.ranostay@intel.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>