MLBEDSW-8783 Decompose CONV_2D with large strides

Add support for CONV_2D with stride > 3:

* Decompose into blocks that fit in accumulator RAM.
  This also adds support for FM dimensions > 64K.
* Add checks for support of accumulator control to architecture.
* Decompose ops with large strides to multiple 1x1-kernel ops, all adding to the same
  accumulators.

Change-Id: I083a5ca112d14019f0317813564e9d3309a69bd1
Signed-off-by: Björn Davidsson <bjoern.davidsson@arm.com>