Specify output dimension formulae for tensor ops

For each tensor op clarify how the output dimensions
of output height (OH) and output width (OW) relate
to the input height (IH) and input width (IW).

Signed-off-by: Dominic Symes <dominic.symes@arm.com>
Change-Id: Iad36041f54e439c944cacf08afac5567dd2bad3f