[media] s5p-tv: Do not ignore regulator/clk API return values in sdo_drv.c

This patch fixes following compilation warning:
drivers/media/platform/s5p-tv/sdo_drv.c: In function ‘sdo_runtime_resume’:
drivers/media/platform/s5p-tv/sdo_drv.c:268:18: warning: ignoring return value of ‘regulator_enable’,
  declared with attribute warn_unused_result
drivers/media/platform/s5p-tv/sdo_drv.c:269:18: warning: ignoring return value of ‘regulator_enable’,
  declared with attribute warn_unused_result

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>