[media] smiapp: Implement power-on and power-off sequences without runtime PM

Power on the sensor when the module is loaded and power it off when it is
removed.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
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