ipa: rkisp1: Store hardware parameters in IPA context

Versions of the ISP differ in the processing blocks they include, as
well as in the implementation of some of those blocks. In particular,
they have different numbers of histogram bins oe AE statistics cells.
The algorithms take these differences into account by checking the ISP
version reported by the driver.

These checks are currently scattered in multiple places. Centralize them
in the IPARkISP1::init() function, and store the version-dependent
hardware parameters in the IPA context, accessible by all algorithms.

While at it, drop the IPASessionConfiguration::hw member that stores the
revision number, unused by the algorithms. It can be added back laer to
the IPAHwSettings structure if needed.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Stefan Klug <stefan.klug@ideasonboard.com>

src/ipa/rkisp1/algorithms/agc.h

@@ -50,9 +50,6 @@ private:
 
 	uint64_t frameCount_;
 
-	uint32_t numCells_;
-	uint32_t numHistBins_;
-
 	utils::Duration filteredExposure_;
 };