ipa: ipu3: agc: Rename currentYGain

The "current" prefix in the currentYGain variable name is confusing:

- In Agc::estimateLuminance(), the variable contains the gain to be
  applied to the image, which is neither a "current" gain nor a "Y"
  gain. Rename it to "gain".

- In Agc::computeExposure(), the variable contains the gain computed by
  the relative luminance method, so rename it to "yGain".

While at it, rename variables to match the libcamera coding style.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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