msm: camera: sensor: Validate sensor name during probe

Some cameras have same sensor id in one device,
but camera sensor driver just validate sensor
id now which may result in wrong probe when camera
daemon is killed and camera re-probe sensor again.

Also validate the sensor name if sensor has probed.

Change-Id: I641bf8c346bada9e6cc619389077e25e666c743f
Signed-off-by: Depeng Shao <dshao@codeaurora.org>