COMPMID-415: Remove google benchmark from documentation

Change-Id: I4aa3801373c7a5e67babcaff6f07da613db11e7f
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/81276
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
2 files changed