media: imx335: Limit analogue gain value

The sensor gain (both analog and digital) are controlled by a
single gain value where:
- 0dB to 30dB correspond to analog gain
- 30.3dB to 72dB correspond to digital gain
  (with 0.3dB step)

Hence, limit the analogue gain value to 100.
For digital gain, support can be added later if needed.

Signed-off-by: Umang Jain <[email protected]>
Reviewed-by: Kieran Bingham <[email protected]>
Reviewed-by: Tommaso Merciai <[email protected]>
Signed-off-by: Sakari Ailus <[email protected]>
Signed-off-by: Hans Verkuil <[email protected]>

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