ipa: rpi: cac: Minor code improvements and tidying

We make a few small improvements to the code:

* The arrayToSet method is prevented from overwriting the end of the
  array if there are too many values in the input table. If you supply
  a table, it will force you to put the correct number of elements in
  it.

* The arrayToSet and setStrength member functions are turned into
  static functions. (There may be a different public setStrength
  member function in future.)

* When no tables at all are given, the configuration is flagged as
  being disabled, so that we can avoid copying tables full of zeroes
  around. As a consequence, the pipeline handler too will disable this
  hardware block rather than run it needlessly. (Note that the tuning
  tool will put in a completely empty "rpi.cac" block if no CAC tuning
  images are supplied, benefiting from this behaviour.)

* The initialise member function is removed as it does nothing.

Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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