IVGCVSW-5552 Generalize versions for Debian Packaging installation guide
IVGCVSW-5552 Generalize versions for Debian Packaging installation guide

 * Remove need to update the guide for each release
   by allowing user to check for newest version

Signed-off-by: Francis Murtagh <e59f6df1240b2b6c2b05aa682b1b9d01b9505720@arm.com>
Change-Id: Ic6dda46524916762a06f24444bd7368ff1cde159

ARM-software/armnn,ARM-software/armnn,ARM-software/armnn