ASoC: Intel: board: Remove .owner initialization in bxt_rt298 driver

The .owner field is not required to be initialized in the driver. So,
remove it.

Signed-off-by: Pradeep Tewani <pradeep.d.tewani@intel.com>
Acked-By: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>