COMPMID-459 Collapse CL Im2col's higher dimensions

Change-Id: I0ccc39cbcf6926e6810faf3fe264c4af7adc3f7b
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/83070
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
7 files changed