MLBEDSW-9356: Reuse weight buffer for consecutive ops

 - Fixed a case where consecutive ops have the same weights and
it is beneficial to share the same weight buffering.
 - Added detection of this use case in the weight buffering
algorithm so it will force a full ofm depth slice and hence
the same weight buffer can be reused and only one dma transer is
needed.

Change-Id: I132f8bdc8d2c692541351e84441ad6c47a5c477f
Signed-off-by: Johan Alfven <johan.alfven@arm.com>